Merge branch 'release/0.11.4'
Merge branch 'release/0.12.0'
Merge branch 'release/0.12.1'
Merge branch 'release/0.12.2'
Merge branch 'release/0.12.3'
Update README.md

Updated installation instructions via composer to use the `composer require` command without specifying a version.
This is the new recommended way of providing this information and it leads to composer picking the proper version constraint (i.e ~1.2), updating the `composer.json` and running install, all in one command.
Merge pull request #1 from rdohms/patch-1

Update README.md
Added getAppNamespace method to Application