Javadoc generation fixes
Javadoc generation fixes

Disable timestamp comments in generated files and restrict the use of our custom javadoc stylesheet to builds under JDK7... using that stylesheet with JDK8 generated files produces bad results.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=95584269

GitHub4Lgfei/guava,mohanaraosv/guava,tunzao/guava,ChengLong/guava,RoliMG/guava,lisb/guava,jedyang/guava,Ariloum/guava,fengshao0907/guava,rob3ns/guava,abel-von/guava,pwz3n0/guava,jayhetee/guava,gmaes/guava,montycheese/guava,anigeorge/guava,hannespernpeintner/guava,mway08/guava,renchunxiao/guava,paplorinc/guava,aiyanbo/guava,norru/guava,mway08/guava,DavesMan/guava,HarveyTvT/guava,weihungliu/guava,sunbeansoft/guava,yuan232007/guava,jackyglony/guava,huangsihuan/guava,HarveyTvT/guava,taoguan/guava,flowbywind/guava,cklsoft/guava,kingland/guava,fengshao0907/guava,witekcc/guava,levenhdu/guava,sebadiaz/guava,dpursehouse/guava,mgalushka/guava,paplorinc/guava,elijah513/guava,tli2/guava,yanyongshan/guava,licheng-xd/guava,aditya-chaturvedi/guava,Akshay77/guava,juneJuly/guava,hannespernpeintner/guava,rgoldberg/guava,seanli310/guava,Yijtx/guava,leogong/guava,BollyCheng/guava,xasx/guava,abel-von/guava,Ariloum/guava,ChengLong/guava,lijunhuayc/guava,yanyongshan/guava,liyazhou/guava,Yijtx/guava,liyazhou/guava,allenprogram/guava,leesir/guava,ignaciotcrespo/guava,ignaciotcrespo/guava,weihungliu/guava,google/guava,jakubmalek/guava,1yvT0s/guava,sebadiaz/guava,lijunhuayc/guava,allenprogram/guava,0359xiaodong/guava,SyllaJay/guava,anigeorge/guava,easyfmxu/guava,monokurobo/guava,KengoTODA/guava,BollyCheng/guava,tobecrazy/guava,disc99/guava,jiteshmohan/guava,rob3ns/guava,witekcc/guava,Akshay77/guava,dushmis/guava,qingsong-xu/guava,juneJuly/guava,kaoudis/guava,AnselQiao/guava,GabrielNicolasAvellaneda/guava,levenhdu/guava,renchunxiao/guava,rcpoison/guava,Xaerxess/guava,1yvT0s/guava,eidehua/guava,SyllaJay/guava,monokurobo/guava,yigubigu/guava,RoliMG/guava,VikingDen/guava,typetools/guava,mgalushka/guava,mohanaraosv/guava,r4-keisuke/guava,norru/guava,google/guava,huangsihuan/guava,dpursehouse/guava,leesir/guava,SaintBacchus/guava,google/guava,KengoTODA/guava,EdwardLee03/guava,ningg/guava,mosoft521/guava,yuan232007/guava,Kevin2030/guava,m3n78am/guava,njucslqq/guava,jankill/guava,typetools/guava,DavesMan/guava,jsnchen/guava,easyfmxu/guava,mosoft521/guava,marstianna/guava,jsnchen/guava,aiyanbo/guava,GabrielNicolasAvellaneda/guava,dushmis/guava,XiWenRen/guava,EdwardLee03/guava,manolama/guava,jayhetee/guava,taoguan/guava,5A68656E67/guava,rgoldberg/guava,eidehua/guava,scr/guava,flowbywind/guava,lisb/guava,thinker-fang/guava,berndhopp/guava,kaoudis/guava,tobecrazy/guava,yigubigu/guava,licheng-xd/guava,DucQuang1/guava,xasx/guava,XiWenRen/guava,mosoft521/guava,njucslqq/guava,Xaerxess/guava,jackyglony/guava,qingsong-xu/guava,seanli310/guava,aditya-chaturvedi/guava,m3n78am/guava,thinker-fang/guava,lgscofield/guava,elijah513/guava,jedyang/guava,jiteshmohan/guava,VikingDen/guava,manolama/guava,codershamo/guava,SaintBacchus/guava,codershamo/guava,GitHub4Lgfei/guava,DucQuang1/guava,cklsoft/guava,rcpoison/guava,gmaes/guava,Kevin2030/guava,jankill/guava,ningg/guava,scr/guava,leogong/guava,berndhopp/guava,tli2/guava,r4-keisuke/guava,5A68656E67/guava,jakubmalek/guava,kingland/guava,0359xiaodong/guava,sunbeansoft/guava,tunzao/guava,AnselQiao/guava,marstianna/guava,pwz3n0/guava,montycheese/guava,lgscofield/guava,disc99/guava