Improve bundle show -V
Remove unneeded require
Guard in outdated? check
Fix remaining spec
Only use Bundler methods for outdated check
add `:ruby_22` platform option
Remove useless gem build step.

This step is not needed since 90a292725101.
Improve path documentation.

REF: https://github.com/bundler/bundler/issues/3214
Fixes: Ancient version check matches unrelated gems
Merge pull request #3267 from Deradon/fixes-ancient-version-check-regex

Fixes: Ancient version check matches unrelated gems
Show gems count after install
:heart: @searls
it can bundle groups of gems with git
add github method
use double quotes
if no uri options passed, use an empty string

This is to help keep Bundler 1.8.7 compatible.
RG 2.3 was never included in a release of Ruby, however the latest minor series
(v2.4) will be included with the release of Ruby 2.2.

The latest version of RG in this series is currently 2.4.4.
[Env] Include git version
cleanup tempdir
Merge pull request #3277 from obfusk/fix-tmpdir-cleanup

cleanup tempdir
ensure that cleanup won’t raise another exception