Updated the "boa" function to catch for missing gems.

* Added checkmark (✓) status for passing projects.
* Failing projects now output the reasons why:
    * Outdated gems are detected and a bullet list is printed.
    * Gems are missing and need to be installed.
Updated the "bua" function to indicate gem dependency status.

* Passing status: ✓.
* Activity status: Updated gem dependencies.
Updated the "bca" function to indicate gem artifact status.

* Passing: ✓.
* Activity: Cleaned gem artifacts.
Updated "rua" function to indicate Ruby version updates per project.

* Up-to-date: ✓.
* Not up-to-date: <old version> --> <new version>.
Removed extra carriage returns "dots" function output.