Issue 4280044: Add CVS backend, by Matthew Dempsky.
Issue 4280044: Add CVS backend, by Matthew Dempsky.

Updated diff from issue 2107041 incorporating feedback.

DeanHere/rietveld,nareshboddepalli/touchites-test,DeanHere/rietveld,andyzsf/rietveld,arg0/rietveld,kscharding/integral-solutions-smxq,nareshboddepalli/touchites-test,xtypebee/rietveld,rietveld-codereview/rietveld,berkus/rietveld,rietveld-codereview/rietveld,kscharding/integral-solutions-smxq,openlabs/cr.openlabs.co.in,ericmckean/rietveld,robfig/rietveld,fuzan/rietveld,google-code-export/rietveld,gco/rietveld,gco/rietveld,sajingeo/rietveld,andyzsf/rietveld,openlabs/cr.openlabs.co.in,gavioto/rietveld,v3ss0n/rietveld,nbodepallictr/touchites-codereview,dushmis/rietveld,nbodepallictr/touchites-test,DeanHere/rietveld,salomon1184/rietveld,gavioto/rietveld,draem0507/rietveld,ericmckean/rietveld,xtypebee/rietveld,rietveld-codereview/rietveld,andyzsf/rietveld,Koulio/rietveld,berkus/rietveld,openlabs/cr.openlabs.co.in,dushmis/rietveld,nareshboddepalli/touchites-codereview,draem0507/rietveld,robfig/rietveld,gavioto/rietveld,arg0/rietveld,supriyantomaftuh/rietveld,supriyantomaftuh/rietveld,dushmis/rietveld,supriyantomaftuh/rietveld,nbodepallictr/touchites-codereview,Koulio/rietveld,ericmckean/rietveld,v3ss0n/rietveld,foolonhill/rietveld,fuzan/rietveld,nareshboddepalli/touchites-codereview,nareshboddepalli/touchites-test,nbodepallictr/touchites-codereview,rietveld-codereview/rietveld,xtypebee/rietveld,salomon1184/rietveld,sajingeo/rietveld,google-code-export/rietveld,aungzanbaw/rietveld,google-code-export/rietveld,salomon1184/rietveld,Koulio/rietveld,nareshboddepalli/touchites-codereview,v3ss0n/rietveld,foolonhill/rietveld,robfig/rietveld,draem0507/rietveld,foolonhill/rietveld,berkus/rietveld,aungzanbaw/rietveld,aungzanbaw/rietveld,kscharding/integral-solutions-smxq,arg0/rietveld,gco/rietveld,fuzan/rietveld,nbodepallictr/touchites-test,nbodepallictr/touchites-test,sajingeo/rietveld