added travis testing
Update readme file
Update readme file
Added Canvas size calculator
Added Canvas size calculator comments
Added Canvas size calculator class comment
Canvas size calculator refactored
Added Image position calculator
Fixed bug
better readable tests
Added Image main class, GD adapter
Free memory
input normalization
Added documentation
refactoring
Can change background color
Adapter can draw image with opacity
Refactoring
Refactoring
Refactoring