brother_ql v0.7.2

New functionality:

• A new argument --rotate was added to the brother_ql_create tool.

Bug Fixes:

• A nasty bug concerning the QL-500 and QL-570 was fixed which prevented full printouts.
• The last line of your image files was missing on the labels. Now it will be printed.
• The --threshold argument wasn't working since moving away from numpy. This is now fixed.