[R] save/load MXNet model with RData format. close #362 (#6494)
[R] save/load MXNet model with RData format. close #362 (#6494)

* [R] mx.serialize/mx.unserialize (close #362)

leezu/mxnet,jamesliu/mxnet,jermainewang/mxnet,kkk669/mxnet,vikingMei/mxnet,Ldpe2G/mxnet,kevinthesun/mxnet,szha/mxnet,precedenceguo/mxnet,sergeykolychev/mxnet,szha/mxnet,zhreshold/mxnet,jennyzhang0215/incubator-mxnet,Ldpe2G/mxnet,kkk669/mxnet,DR08/mxnet,ptrendx/mxnet,luoyetx/mxnet,kevinthesun/mxnet,weleen/mxnet,sergeykolychev/mxnet,apache/incubator-mxnet,navrasio/mxnet,coder-james/mxnet,TuSimple/mxnet,CodingCat/mxnet,yuruofeifei/mxnet,leezu/mxnet,EvanzzzZ/mxnet,Ldpe2G/mxnet,indhub/mxnet,jiajiechen/mxnet,ZihengJiang/mxnet,eric-haibin-lin/mxnet,hotpxl/mxnet,fullfanta/mxnet,danithaca/mxnet,arank/mxnet,madjam/mxnet,leezu/mxnet,formath/mxnet,hotpxl/mxnet,tornadomeet/mxnet,coder-james/mxnet,TuSimple/mxnet,ykim362/mxnet,jamesliu/mxnet,Northrend/mxnet,weleen/mxnet,Prasad9/incubator-mxnet,sergeykolychev/mxnet,precedenceguo/mxnet,TuSimple/mxnet,mbaijal/incubator-mxnet,smolix/incubator-mxnet,larroy/mxnet,larroy/mxnet,larroy/mxnet,ForkedReposBak/mxnet,arank/mxnet,sergeykolychev/mxnet,wangyum/mxnet,DR08/mxnet,xcgoner/dist-mxnet,tlby/mxnet,apaleyes/mxnet,Ldpe2G/mxnet,thirdwing/mxnet,EvanzzzZ/mxnet,kevinthesun/mxnet,ZihengJiang/mxnet,Ldpe2G/mxnet,Mega-DatA-Lab/mxnet,ForkedReposBak/mxnet,weleen/mxnet,weleen/mxnet,Mega-DatA-Lab/mxnet,arikpoz/mxnet,wangyum/mxnet,rahul003/mxnet,jennyzhang0215/incubator-mxnet,LinkHS/incubator-mxnet,yuruofeifei/mxnet,zhreshold/mxnet,DR08/mxnet,fullfanta/mxnet,gautamkmr/incubator-mxnet,sergeykolychev/mxnet,reminisce/mxnet,EvanzzzZ/mxnet,thirdwing/mxnet,ykim362/mxnet,sxjscience/mxnet,hpi-xnor/BMXNet,reminisce/mxnet,lxn2/mxnet,stefanhenneking/mxnet,gautamkmr/incubator-mxnet,piiswrong/mxnet,mbaijal/incubator-mxnet,smolix/incubator-mxnet,CodingCat/mxnet,hotpxl/mxnet,DR08/mxnet,arikpoz/mxnet,weleen/mxnet,ForkedReposBak/mxnet,ForkedReposBak/mxnet,vikingMei/mxnet,tornadomeet/mxnet,fullfanta/mxnet,dmlc/mxnet,vikingMei/mxnet,thirdwing/mxnet,tlby/mxnet,coder-james/mxnet,wangyum/mxnet,Mega-DatA-Lab/mxnet,sxjscience/mxnet,solin319/incubator-mxnet,LinkHS/incubator-mxnet,hpi-xnor/BMXNet,larroy/mxnet,arank/mxnet,ShownX/incubator-mxnet,tlby/mxnet,antoan2/incubator-mxnet,kkk669/mxnet,yajiedesign/mxnet,TuSimple/mxnet,Mega-DatA-Lab/mxnet,hpi-xnor/BMXNet,vikingMei/mxnet,tornadomeet/mxnet,formath/mxnet,ptrendx/mxnet,larroy/mxnet,Ldpe2G/mxnet,navrasio/mxnet,Ldpe2G/mxnet,ykim362/mxnet,yajiedesign/mxnet,jennyzhang0215/incubator-mxnet,hpi-xnor/BMXNet,ZihengJiang/mxnet,jamesliu/mxnet,reminisce/mxnet,apaleyes/mxnet,coder-james/mxnet,Prasad9/incubator-mxnet,luoyetx/mxnet,mbaijal/incubator-mxnet,fullfanta/mxnet,crazy-cat/incubator-mxnet,fullfanta/mxnet,gautamkmr/incubator-mxnet,sxjscience/mxnet,pluskid/mxnet,crazy-cat/incubator-mxnet,EvanzzzZ/mxnet,indhub/mxnet,szha/mxnet,thirdwing/mxnet,madjam/mxnet,navrasio/mxnet,reminisce/mxnet,ykim362/mxnet,formath/mxnet,rahul003/mxnet,kkk669/mxnet,ShownX/incubator-mxnet,gautamkmr/incubator-mxnet,jiajiechen/mxnet,arikpoz/mxnet,hotpxl/mxnet,rahul003/mxnet,reminisce/mxnet,arank/mxnet,apaleyes/mxnet,TuSimple/mxnet,saurabh3949/mxnet,ptrendx/mxnet,Ldpe2G/mxnet,jennyzhang0215/incubator-mxnet,pluskid/mxnet,apaleyes/mxnet,kevinthesun/mxnet,rahul003/mxnet,yajiedesign/mxnet,yuruofeifei/mxnet,TuSimple/mxnet,gautamkmr/incubator-mxnet,kevinthesun/mxnet,ptrendx/mxnet,madjam/mxnet,jiajiechen/mxnet,stefanhenneking/mxnet,larroy/mxnet,ZihengJiang/mxnet,arikpoz/mxnet,sxjscience/mxnet,hpi-xnor/BMXNet,Northrend/mxnet,wangyum/mxnet,rahul003/mxnet,smolix/incubator-mxnet,piiswrong/mxnet,piiswrong/mxnet,antoan2/incubator-mxnet,kkk669/mxnet,nicklhy/mxnet,EvanzzzZ/mxnet,formath/mxnet,pluskid/mxnet,jamesliu/mxnet,saurabh3949/mxnet,gautamkmr/incubator-mxnet,jermainewang/mxnet,jiajiechen/mxnet,hesseltuinhof/mxnet,weleen/mxnet,Northrend/mxnet,LinkHS/incubator-mxnet,wangyum/mxnet,crazy-cat/incubator-mxnet,hotpxl/mxnet,sxjscience/mxnet,ykim362/mxnet,xcgoner/dist-mxnet,luoyetx/mxnet,hesseltuinhof/mxnet,formath/mxnet,LinkHS/incubator-mxnet,navrasio/mxnet,madjam/mxnet,mbaijal/incubator-mxnet,yajiedesign/mxnet,nicklhy/mxnet,crazy-cat/incubator-mxnet,saurabh3949/mxnet,zhreshold/mxnet,dmlc/mxnet,tlby/mxnet,luoyetx/mxnet,arank/mxnet,solin319/incubator-mxnet,rahul003/mxnet,EvanzzzZ/mxnet,xcgoner/dist-mxnet,danithaca/mxnet,Ldpe2G/mxnet,danithaca/mxnet,coder-james/mxnet,pluskid/mxnet,wangyum/mxnet,eric-haibin-lin/mxnet,hesseltuinhof/mxnet,DR08/mxnet,kkk669/mxnet,arank/mxnet,weleen/mxnet,yuruofeifei/mxnet,antoan2/incubator-mxnet,TuSimple/mxnet,hesseltuinhof/mxnet,luoyetx/mxnet,crazy-cat/incubator-mxnet,dmlc/mxnet,vikingMei/mxnet,indhub/mxnet,arikpoz/mxnet,lxn2/mxnet,yuruofeifei/mxnet,kkk669/mxnet,indhub/mxnet,ShownX/incubator-mxnet,pluskid/mxnet,Prasad9/incubator-mxnet,tornadomeet/mxnet,eric-haibin-lin/mxnet,coder-james/mxnet,smolix/incubator-mxnet,nicklhy/mxnet,vikingMei/mxnet,larroy/mxnet,madjam/mxnet,arank/mxnet,jermainewang/mxnet,hesseltuinhof/mxnet,ShownX/incubator-mxnet,jiajiechen/mxnet,xcgoner/dist-mxnet,danithaca/mxnet,madjam/mxnet,crazy-cat/incubator-mxnet,indhub/mxnet,mbaijal/incubator-mxnet,kevinthesun/mxnet,piiswrong/mxnet,nicklhy/mxnet,CodingCat/mxnet,stefanhenneking/mxnet,ptrendx/mxnet,eric-haibin-lin/mxnet,formath/mxnet,jiajiechen/mxnet,dmlc/mxnet,xcgoner/dist-mxnet,eric-haibin-lin/mxnet,formath/mxnet,jermainewang/mxnet,stefanhenneking/mxnet,rahul003/mxnet,reminisce/mxnet,Mega-DatA-Lab/mxnet,precedenceguo/mxnet,hpi-xnor/BMXNet,saurabh3949/mxnet,weleen/mxnet,jennyzhang0215/incubator-mxnet,hesseltuinhof/mxnet,precedenceguo/mxnet,nicklhy/mxnet,arank/mxnet,saurabh3949/mxnet,tlby/mxnet,leezu/mxnet,hotpxl/mxnet,crazy-cat/incubator-mxnet,hotpxl/mxnet,EvanzzzZ/mxnet,LinkHS/incubator-mxnet,TuSimple/mxnet,arank/mxnet,ykim362/mxnet,smolix/incubator-mxnet,wangyum/mxnet,ykim362/mxnet,piiswrong/mxnet,dmlc/mxnet,leezu/mxnet,navrasio/mxnet,sxjscience/mxnet,sergeykolychev/mxnet,hesseltuinhof/mxnet,nicklhy/mxnet,tornadomeet/mxnet,saurabh3949/mxnet,jennyzhang0215/incubator-mxnet,nicklhy/mxnet,hpi-xnor/BMXNet,solin319/incubator-mxnet,luoyetx/mxnet,xcgoner/dist-mxnet,precedenceguo/mxnet,reminisce/mxnet,thirdwing/mxnet,antoan2/incubator-mxnet,antoan2/incubator-mxnet,coder-james/mxnet,solin319/incubator-mxnet,crazy-cat/incubator-mxnet,Prasad9/incubator-mxnet,yajiedesign/mxnet,piiswrong/mxnet,EvanzzzZ/mxnet,sxjscience/mxnet,tornadomeet/mxnet,dmlc/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,leezu/mxnet,ForkedReposBak/mxnet,ZihengJiang/mxnet,ptrendx/mxnet,szha/mxnet,apaleyes/mxnet,apache/incubator-mxnet,ptrendx/mxnet,piiswrong/mxnet,solin319/incubator-mxnet,luoyetx/mxnet,CodingCat/mxnet,yajiedesign/mxnet,navrasio/mxnet,hesseltuinhof/mxnet,madjam/mxnet,szha/mxnet,lxn2/mxnet,szha/mxnet,LinkHS/incubator-mxnet,zhreshold/mxnet,CodingCat/mxnet,tlby/mxnet,apaleyes/mxnet,pluskid/mxnet,Mega-DatA-Lab/mxnet,lxn2/mxnet,madjam/mxnet,nicklhy/mxnet,hotpxl/mxnet,lxn2/mxnet,DR08/mxnet,jennyzhang0215/incubator-mxnet,thirdwing/mxnet,ShownX/incubator-mxnet,eric-haibin-lin/mxnet,rahul003/mxnet,danithaca/mxnet,apaleyes/mxnet,navrasio/mxnet,Northrend/mxnet,jamesliu/mxnet,jennyzhang0215/incubator-mxnet,dmlc/mxnet,thirdwing/mxnet,tornadomeet/mxnet,DickJC123/mxnet,luoyetx/mxnet,stefanhenneking/mxnet,danithaca/mxnet,piiswrong/mxnet,apache/incubator-mxnet,antoan2/incubator-mxnet,CodingCat/mxnet,tlby/mxnet,fullfanta/mxnet,solin319/incubator-mxnet,kevinthesun/mxnet,lxn2/mxnet,piiswrong/mxnet,xcgoner/dist-mxnet,larroy/mxnet,solin319/incubator-mxnet,jermainewang/mxnet,coder-james/mxnet,jennyzhang0215/incubator-mxnet,yajiedesign/mxnet,zhreshold/mxnet,LinkHS/incubator-mxnet,ShownX/incubator-mxnet,wangyum/mxnet,ptrendx/mxnet,smolix/incubator-mxnet,kevinthesun/mxnet,Northrend/mxnet,stefanhenneking/mxnet,jermainewang/mxnet,apaleyes/mxnet,jamesliu/mxnet,eric-haibin-lin/mxnet,jamesliu/mxnet,eric-haibin-lin/mxnet,danithaca/mxnet,szha/mxnet,DickJC123/mxnet,indhub/mxnet,ForkedReposBak/mxnet,Prasad9/incubator-mxnet,ShownX/incubator-mxnet,szha/mxnet,ptrendx/mxnet,jamesliu/mxnet,CodingCat/mxnet,fullfanta/mxnet,smolix/incubator-mxnet,sergeykolychev/mxnet,jiajiechen/mxnet,gautamkmr/incubator-mxnet,precedenceguo/mxnet,tornadomeet/mxnet,tlby/mxnet,DR08/mxnet,Northrend/mxnet,hesseltuinhof/mxnet,yajiedesign/mxnet,reminisce/mxnet,Northrend/mxnet,Prasad9/incubator-mxnet,sergeykolychev/mxnet,tlby/mxnet,mbaijal/incubator-mxnet,TuSimple/mxnet,thirdwing/mxnet,navrasio/mxnet,kkk669/mxnet,indhub/mxnet,gautamkmr/incubator-mxnet,apaleyes/mxnet,CodingCat/mxnet,Northrend/mxnet,arikpoz/mxnet,hotpxl/mxnet,lxn2/mxnet,vikingMei/mxnet,xcgoner/dist-mxnet,kevinthesun/mxnet,stefanhenneking/mxnet,yuruofeifei/mxnet,DickJC123/mxnet,jermainewang/mxnet,precedenceguo/mxnet,thirdwing/mxnet,ZihengJiang/mxnet,tlby/mxnet,zhreshold/mxnet,DR08/mxnet,coder-james/mxnet,vikingMei/mxnet,ykim362/mxnet,larroy/mxnet,Prasad9/incubator-mxnet,dmlc/mxnet,Mega-DatA-Lab/mxnet,fullfanta/mxnet,antoan2/incubator-mxnet,DickJC123/mxnet,stefanhenneking/mxnet,ZihengJiang/mxnet,jermainewang/mxnet,LinkHS/incubator-mxnet,kkk669/mxnet,sergeykolychev/mxnet,yajiedesign/mxnet,gautamkmr/incubator-mxnet,weleen/mxnet,jamesliu/mxnet,antoan2/incubator-mxnet,TuSimple/mxnet,EvanzzzZ/mxnet,solin319/incubator-mxnet,leezu/mxnet,rahul003/mxnet,arikpoz/mxnet,nicklhy/mxnet,precedenceguo/mxnet,hpi-xnor/BMXNet,jermainewang/mxnet,smolix/incubator-mxnet,vikingMei/mxnet,formath/mxnet,solin319/incubator-mxnet,luoyetx/mxnet,yuruofeifei/mxnet,smolix/incubator-mxnet,saurabh3949/mxnet,szha/mxnet,Mega-DatA-Lab/mxnet,danithaca/mxnet,ShownX/incubator-mxnet,mbaijal/incubator-mxnet,wangyum/mxnet,danithaca/mxnet,navrasio/mxnet,pluskid/mxnet,leezu/mxnet,indhub/mxnet,saurabh3949/mxnet,Northrend/mxnet,madjam/mxnet,pluskid/mxnet,pluskid/mxnet,Prasad9/incubator-mxnet,yuruofeifei/mxnet,zhreshold/mxnet,apache/incubator-mxnet,eric-haibin-lin/mxnet,hpi-xnor/BMXNet,xcgoner/dist-mxnet,indhub/mxnet,sxjscience/mxnet,dmlc/mxnet,ForkedReposBak/mxnet,ForkedReposBak/mxnet,stefanhenneking/mxnet,ForkedReposBak/mxnet,crazy-cat/incubator-mxnet,precedenceguo/mxnet,ZihengJiang/mxnet,fullfanta/mxnet,jiajiechen/mxnet,saurabh3949/mxnet,arikpoz/mxnet,formath/mxnet,reminisce/mxnet,ykim362/mxnet,zhreshold/mxnet,lxn2/mxnet,zhreshold/mxnet,CodingCat/mxnet,arikpoz/mxnet,tornadomeet/mxnet,DR08/mxnet,jiajiechen/mxnet,reminisce/mxnet,ZihengJiang/mxnet,antoan2/incubator-mxnet,Mega-DatA-Lab/mxnet,mbaijal/incubator-mxnet,Prasad9/incubator-mxnet,ptrendx/mxnet,ShownX/incubator-mxnet,yuruofeifei/mxnet,sxjscience/mxnet,LinkHS/incubator-mxnet,lxn2/mxnet