allow basic patchlevel support in ruby directive of Gemfile, closes #2914
move lookup_patchsets to patches
fix tracing output in logging
fix RedHat _system_name fallback, fix #2917
allow forcing implode
allow fallback from git to scmgit-base for older systems, fix #2920
improve check for available packages in solaris, update #2920
make sure executable-hooks is installed before running regenerate_binstubs, fix #2808
simplify selecting master branch for non mri
add rubinius 1.3.3
fix installing gems for rubinius, update #2808
fix migrating ruby aliases, update #2808
jruby 1.7.13, thanks @enebo