Merge branch 'hotfix/1.25.7'
improved logging for migrating aliases
remove new version check from help install, fix #2462
add patch to fix jruby-1.7.9 installation from source, fix #2465, update #2459, update jruby/jruby#1363
bump default rubygems to latest-2.2
copy only bin and lib for jruby, closes jruby/jruby#1364
cleanup rubygems installation messages
make sure to unset rvm_rubygems_version when exiting rvm function
2.0.0 is the currently oldest maitained ruby
separate documentation in disk-usage
make sure there is enough free disk space to migrate gemsets, fix #2464
split manage/base into smaller pieces
whitespace formating base_install
predict required space for ruby installation and warn users if there is not enough disk space, update #2464
bump rubinius version
fix gemsets, fix #2466
improve reseting environment before loading environment file, fix #2461
removing code duplication from selectors
extending the Help RVM 2.0 note for installation
add old GC variables silencing patch, fix #2468