Bootstrapping currently repeats on every run due to the `creates => '/usr/local/bin/pip'`
Centos 7(and possibly others) which place pip executable in /usr/bin/pip
The repeated bootstrap needs to be patched to avoid nodes constantly grabbing the get_pip.py which includes a binary blob.

This patching looks to have been attempted before but failed to include `path => ....` which would support finding `which` in any of those locations as well as allowing `which pip` to only look in the supplied path, basically extending our creates to support multiple locations of pip.

Patch to support Centos 7 in bootstrap

Add "args" option to gunicorn config

Use a single grep instead of a double pipe

Search index when staying at the latest version

The new version handles checking the validity of metadata.json. With
this we no longer need the `rake metadata_lint` as part of the CI
process.

Fix travis

* Fix to spec test. Functionality change was merged, but the spec test
  was forgotten and this prevented CI from passing.

* Support more minor versions of Puppet v4 explicitly.

* Continue supporting Ruby versions < 2