Additional Exception information

Adds path and source information to the exception message if file can
not be found
JPEG Quality Setting

adds possibility to set the quality of JPEG files. reduces produced file
sizes massively
Delete option when reaching max_crops

Adds an option to delete crops (starting oldest) if max_crops limit is
reached or (historically) already surpassed.
Adding config comments and changing to tabs
Refactoring to make more terse and match code conventions
Merge pull request #1 from BKWLD/mhaszprunar-patch-1

Mhaszprunar patch 1
Insert missing semicolon
Merge pull request #38 from mhaszprunar/laravel-3

Laravel 3