Merge branch 'hotfix/1.25.18' into stable
add patches to fix compilation of 1.9.3 and 2.0.0 on cygwin, fix #2632
set PS4 only when tracing, fix #2625
Add "float_warnings" patchsets for 2.1 and 2.1.0p0
Merge pull request #2642 from knugie/master

Add "float_warnings" patchsets for 2.1 and 2.1.0p0
Add ruby 1.9.3-p545
Add ruby 2.0.0-p451
Add ruby 2.1.1
Merge pull request #2645 from kugaevsky/add_new_rubies

Add new rubies
update new rubies, update #2645
1.25.19
Merge branch 'master' into hotfix/1.25.19
Merge branch 'hotfix/1.25.19' into stable
Merge branch 'hotfix/1.25.19'
Update rvm-prompt

Semver compliance.
Merge pull request #2647 from elia/patch-3

Update rvm-prompt
autoupdate on rvm list known, fix #2648
Merge branch 'master' of github.com:wayneeseguin/rvm
added ruby 2.1.1 patches
Merge pull request #2649 from skaes/ruby-2.1.1-patches

added ruby 2.1.1 patches