update README.md
update README.md

remove old info and add links to documents.
add travis badges
cleanup lib dependency info

lookup1980/OpenSubdiv,xldeveloper/OpenSubdiv,anshuarya/OpenSubdiv,takahito-tejima/OpenSubdiv,c64kernal/OpenSubdiv,c64kernal/OpenSubdiv,anshuarya/OpenSubdiv,nyotis/OpenSubdiv,lookup1980/OpenSubdiv,shengfuintel/OpenSubdiv,takahito-tejima/OpenSubdiv,c64kernal/OpenSubdiv,xldeveloper/OpenSubdiv,nyotis/OpenSubdiv,shengfuintel/OpenSubdiv,anshuarya/OpenSubdiv,takahito-tejima/OpenSubdiv,nyotis/OpenSubdiv,xldeveloper/OpenSubdiv,lookup1980/OpenSubdiv,shengfuintel/OpenSubdiv