Merge branch 'hotfix/1.18.10' into stable
add ruby 2.0.0-p0
document --autolibs=, closes #1565
fix knows string
fix default install ruby version
Merge pull request #1578 from takkanm/use_ruby_2_0_0

add ruby 2.0.0-p0, closes #1579
Merge branch 'master' of github.com:wayneeseguin/rvm
1.18.11
Merge pull request #1578 from takkanm/use_ruby_2_0_0

add ruby 2.0.0-p0, closes #1579
Merge branch 'hotfix/1.18.11'