Renamed transform option 'size' to 'resize'
Fixed failed tests for transforming photos
Removed allowing iterators to be passed to `push()`
Some code comment update
Added upload from url shortcut + php doc updates
Updated tests for ArrayUtils and FileUtils
Added PhotoCollectionTests
Added AwsS3Storage tests
Added replace() to StorageManager for swapping existing storage
Some code cleanup
Tests
Allow for extending & implementing custom transformers
Updated tests