Moved all styles to new styles file
Improved styling of tables
Added support for python 2
Removed a to-do
Refactorized and tested chunk function and usage
Improved again the chunk function and refactorized strategies and invoice generator
Made a little refactor to strategies file
Texts are now correctly aligned
Main color is now a constant on styling
Removed abstract template
Removed unused constant
Added realistic fixtures for tests
Merge branch 'develop'