RVM 1.26.4 released, improved compatibility with new systems and new rubies
- RVM#3142 add .mkshrc to target_rc list for dotfiles detection/installation
 - RVM#3151 make OSX 10.8+ with macports use gcc48 instead of apple-gcc42
 - RVM#3152 handle old rubygems setup documentation flag
 - RVM#3155 Redirect stderr for "which gpg*" commands to /dev/null
 - RVM#3156 improved gemset update
 - RVM#3158 reverted
 - RVM#3161 rvm_gpg_command: allow for paths with spaces
 - RVM#3162 Add "float_warnings" patchsets for rubies
 - RVM#3163 uninstall gcc46 on OSX 10.10
 - RVM#3167 ensure return status when failed curl on rvm get
 - RVM#3169 Fixed small typo (exceute => execute)
 - RVM#3170 fix gemset empty 
 - RVM#3173 Use gcc49 with fink on OSX 10.10
 - RVM#3174 use only first line of detected version
 - RVM#3175 fix installing MRI on RHEL 6
 - RVM#3176 communicate apt sources 404 errors
 - RVM#3180 update remote rubies to point to the cache
 - RVM#3181 correctly set opt_dir when building ruby-head for freebsd
 - RVM#3182 use clang for rbx compilation on ubuntu/debian
 - RVM#3190 ensure the created ssl certs are readable by user
 - remove ruby tricks, update travis-ci/travis-ci#2840
 - move loading ps1 functions from etc/profile.d/rvm.sh to scripts/rvm
 - remove sourcing default from rvm-auto-ruby, update jish/pre-commit#190
 - use :space: instead of tab escape and space char
 - install clang/llvm on debian/ubuntu for rubinius
 - use cc/cxx options for rubinius configure on debina/ubuntu
 - add rubies jruby-1.7.16.2, ruby-2.2.0-preview2, jruby-1.7.17
 
here are full changes: https://github.com/rvm/rvm/compare/1.26.3...1.26.4