add hpp to valid cpplint extensions
add hpp to valid cpplint extensions

intelcaffe/caffe-old,liuxianming/caffe_feedback,wangg12/caffe,niuzhiheng/caffe,suixudongi8/caffe,xidianwlc/caffe,intelcaffe/caffe-old,niuzhiheng/caffe,flickr/caffe,pcoving/caffe,yikeliu/caffe-future,pcoving/caffe,dculibrk/boosted_pooling,minghuam/caffe,yikeliu/caffe-future,Hilovaiserillis/caffe,MoskalenkoViktor/caffe,naeluh/caffe,MoskalenkoViktor/caffe,vibhav-vineet/caffe,shuimulinxi/caffe,bharath272/sds_eccv2014,audtlr24/caffe,tackgeun/caffe,audtlr24/caffe,shiquanwang/caffe,minghuam/caffe,orentadmor/caffe,dylansun/caffe,sichenucsd/caffe_si,Hilovaiserillis/caffe,shuimulinxi/caffe,CZCV/s-dilation-caffe,flickr/caffe,CZCV/s-dilation-caffe,longjon/caffe,niuzhiheng/caffe,sichenucsd/caffe_si,suixudongi8/caffe,pcoving/caffe,intelcaffe/caffe-old,yikeliu/caffe-future,nicodjimenez/caffe,Hilovaiserillis/caffe,vibhav-vineet/caffe,MoskalenkoViktor/caffe,Hilovaiserillis/caffe,xidianwlc/caffe,naeluh/caffe,wangg12/caffe,gnina/gnina,longjon/caffe,liuxianming/caffe_feedback,liuxianming/caffe_feedback,flickr/caffe,nicodjimenez/caffe,hotpxl/caffe-m2,gnina/gnina,audtlr24/caffe,naeluh/caffe,hotpxl/caffe-m2,dylansun/caffe,vibhav-vineet/caffe,orentadmor/caffe,minghuam/caffe,hotpxl/caffe-m2,liuxianming/caffe_feedback,sichenucsd/caffe_si,naeluh/caffe,naeluh/caffe,nicodjimenez/caffe,intelcaffe/caffe-old,gnina/gnina,niuzhiheng/caffe,dculibrk/boosted_pooling,flickr/caffe,liuxianming/caffe_feedback,MoskalenkoViktor/caffe,longjon/caffe,shuimulinxi/caffe,vibhav-vineet/caffe,CVML/sds_eccv2014,gogartom/caffe-textmaps,pcoving/caffe,gogartom/caffe-textmaps,hotpxl/caffe-m2,gogartom/caffe-textmaps,dculibrk/boosted_pooling,shiquanwang/caffe,orentadmor/caffe,shiquanwang/caffe,gogartom/caffe-textmaps,tackgeun/caffe,xidianwlc/caffe,niuzhiheng/caffe,dculibrk/boosted_pooling,MoskalenkoViktor/caffe,tackgeun/caffe,shiquanwang/caffe,Hilovaiserillis/caffe,tackgeun/caffe,audtlr24/caffe,suixudongi8/caffe,CZCV/s-dilation-caffe,shuimulinxi/caffe,gnina/gnina,CZCV/s-dilation-caffe,xidianwlc/caffe,sichenucsd/caffe_si,longjon/caffe,dculibrk/boosted_pooling,wangg12/caffe,pcoving/caffe,orentadmor/caffe,hotpxl/caffe-m2,flickr/caffe,dylansun/caffe,nicodjimenez/caffe,gnina/gnina,gnina/gnina,minghuam/caffe,shuimulinxi/caffe,nicodjimenez/caffe,suixudongi8/caffe,wangg12/caffe,dylansun/caffe,audtlr24/caffe,dylansun/caffe,yikeliu/caffe-future