Merge branch 'hotfix/1.17.2' into stable
make sure unpacked files are group writable when needed, fix #1370
fix fixing group permissions, update #1370
fix fixing group permissions for remote rubies, update #1370
fix missing compiler for binary rubies, fix #1372
add brackets to list of escaped chars in .rvmrc, fix #1376
Set CDPATH to . instead of unsetting.

Should avoid breaking tab completion in zsh.

Update #1375
fix installing from feature/ branches
Merge branch 'master' of github.com:wayneeseguin/rvm
make sure to use __rvm_sed_i, update #1372
fix updating compiler, fix #1372
clean patchsets installation, fix #1368
move maglev start to a hook for easier maintenaance
simplify argument parsing for rvm group, update #1371
improve rvm implode messages, fix #1380
ruby 1.9.1 requires the nossl2 patch
improve rubygems installation errors detection
fix timeouts and order of checking for existing binary downloads, fix #1379
delay updating configure opt-dir so it does not affect openssl compilation
Stub out cd with __rvm_cd

Leaves CDPATH alone except when actually switching directories

Also fix some unquoted paths