Working prototype

Commit before the switch from stretching the image within the canvas to
stretching the image within the pdf.
Immage cutting working properly
pdf generation functional

Missing features in the pdf generation (related to library used):
* landscape mode
* page sizes (custom & standard)
Issues:
* additional top and bottom margin added
* watermark included on each page
Moved todo/bugs to github internal system
Landscape + page sizes now supported in PDF