Suggestion to fix TODO # bin/refinerycms:301

[othatbrian]

I attempted to install refinerycms on an ubuntu server. I was missing several packages, so gem installations [from refinerycms] kept bombing, and I kept having to remove my installation and try again (after installing O/S packages). I wanted to change it and noticed in bin/refinerycms @ line 301 the "TODO" to add return value checking after gem installs.

The pull request here includes a simple check after the "bundle install" command, which I found to work very well when a [necessary] gem can't be installed (because, for example, an O/S package is missing). I was NOT able to cause the "bundle update" to fail, so I could not test that. Possibly this same snippet of code (lines 310-315) could be applied at line 306 as well?

This is my 1st ever open source patch contribution/suggestion, so please take it easy on me!

[parndt]

This is awesome, I've just expanded on what you've done including support for bundle update and I'll push this shortly.

[parndt]

Tip: To test failure on bundle update I went into the rails console and then modified one of the Gemfile lines' versions to be say, '~> aad0.9' which causes a failure, then ran bundle update and checked $? afterward.