updated OS support list
updated OS support list

updated OS support list to remove retired Ubuntu 10, and include R2 2012 DC
jtowns3/PublicKB,ack/PublicKB,jwebs1/PublicKB,BryGittyUp/PublicKB,anthonyvetter/PublicKB,mfar78/PublicKB,appfog/PublicKB,adamd/PublicKB,duvander/PublicKB,eschubert/PublicKB,daveshac/PublicKB,robertlesieur/PublicKB,jmalmadclc/PublicKB,ryanbrockman/PublicKB,justinwithington/PublicKB,leporaj/PublicKB,BobStolzberg/PublicKB,maxim-clc/PublicKB,jwcolbert/PublicKB,keithresar/clc_public_kb,mark-turpin/PublicKB,robcaldwell/PublicKB,csterwa/PublicKB,StephanieWong/PublicKB,DLM1/PublicKB