Lots of refactoring

Carbon integration
Some name changes
Database refactoring
Execution time per queue item and in total
New status: being processed
Fixes and some more refactoring.

+ PHPDocs
Disable alias, disable auto log

Disable the package's alias, since it doesn't seem to work
Disable the auto logging feature
Composer version update (compatible with Laravel 4 in general)
Remove unnecessary imports
Code cleanup
Update Composer requirements
Nesbot/Carbon Composer requirement update
Typo fix
Refactoring and fixes

Refactored some classes and names
Added a facade
Fixed configuration file
Better coding (IoC)
Readme + Typo
Merge branch 'release/0.3'