Merge branch 'hotfix/1.25.34'
Correct pkg-config to pkgconfig for EL 7

Prior to this commit, `rvm requirements` attempted to bring in
`pkg-config` for EL 7. However, this package doesn't exist; the
correct package name is `pkgconfig`.

This commit renames the package for Red Hat 7, and allows Rubies to be
compiled successfully.
Merge pull request #3101 from rji/el7-pkgconfig-fixup

Correct pkg-config to pkgconfig for EL 7
https binaries url for jruby, thanks @headius
Merge branch 'master' of github.com:wayneeseguin/rvm
add better notifications for using sudo to create certificates dir, closes #3103
escape git so no aliases / functions take effect, update #3102
Removed a typo
Merge pull request #3104 from burningTyger/patch-1

Removed a typo
ruby 2.1.4
2.0.0-p594
ruby-1.9.3-p550
Merge branch 'master' of github.com:wayneeseguin/rvm
warn bash 4 - 4.1.999 users of lack of compatibility issues, update #3106
make sure no unescaped grep is used, fix #3107
Revert "warn bash 4 - 4.1.999 users of lack of compatibility issues, update #3106" - closes #3106

This reverts commit 9370330dda801020f1f5777630a231949298d898.
+jruby-1.7.16.1
upgrade jruby binaries to https
sign the installer
force PGP checks of stable releases, closes #3105

- switch stable to use latest instead of branch
- add detection of available signatures
- enforce check when signatures available
- fix debug output missing newline