Updates for CakePHP 4.0

The plugin now requires at least CakePHP 4.0

Updates for CakePHP 3.7

The plugin now requires at least CakePHP 3.7

Fixing a bug in the thumbnail() method

65d9d47 - Fixing the helper test due to CakePHP core changes
fb9137e - Updating composer, set Imagine to 0.6.x instead of using *
d21f2e9 - Attempt to fix #42
c7ac417 - Adding another test for thumbnails because of #42

5.4 dropped, Behavior refactored

php 5.4 has officially been deprecated and has reached it's end of life by September 2015. The plugin might still work with 5.4 but I won't care much about it any more and some dependent libs will probably act similar.

Also the whole behavior internals were moved to the image processor class. The behavior acts now just as a proxy to the processor class but is fully backward compatible.

848d5aa - Refining tests
d2a80f3 - Documentation fixes
8e07595 - Adding tests
6ebaf9a - Merge pull request #41 from burzum/behavior-refactor
71b529f - Introducing events to the image processing behavior.
3c97c44 - Bye bye php 5.4!
3ca89c6 - Attempt to fix the 5.4 tests
4dcc8a1 - Made the behavior using the processor class.