Updating Linguist version for v4.2.4
Merge branch 'master' into cut-release-v4.2.4
4.2.5b1
Add script/bootstrap

This just runs Bundler with the right options. Maybe it will do more in
the future, like update submodules.
Ignore vendor/gems

This is where script/bootstrap places the bundle.
Merge pull request #1895 from github/bootstrap-script

Add script/bootstrap
4.2.5
Longer timeout
Merge pull request #1890 from github/cut-release-v4.2.4

Updating Linguist version for v4.2.4