Update FrameworkDependenciesMojo to download and copy <type>dll</type> dependencies
Allow consumer to configure unity plugins directory
Use constants for some string values
Clean up some log messages
Add some additional logging to dependency mojo
Fix logging and dll type constant
Merge branch 'develop' of https://github.com/mestevens/unity-maven-plugin into develop
Merge pull request #2 from jpennell/develop

Update mojo to support dependencies with <type>dll</type>