Removed previous code to set bg to white for transparent pixels due to noise in bg and jagged edges
Fixed a conflict in resizer
Refining mime check

It is better to check the image not by its seen extension, but by its origin header of creation. 
So when image are renamed from png to jpg, it wont threat that image as png
because the library like GD would get error.  
Merge pull request #17 from arifLogic/master

Refining mime check, not from ext
Coding style
Add a file check to ensure that the file exists before trying to process it
Merge branch 'release/v1.2'
Added smarter config loading. If resizer.php is avaiable in the config directory, it will be loaded. Otherwise the defaults will be loaded from the bundle
Updated readme
bumped up the version
Merge branch 'feature/smarter-config' into develop
Merge branch 'release/v1.21'
Merge branch 'master' into develop