Delete trailing whitespace
Remove unused imports
Reformat imports to use multiple lines
Reorder imports as recommended by PEP8
Reformat docstrings as recommended by PEP257
Remove redundant if/else
Add line breaks to long lines
Remove unused variable
Use is operator when comparing against None
Use single quotes for strings
Convert unassigned list comprehension to loop
Fixed bug in file backend.
Fixed Python 3 compatibility issue.
Fixed version number in setup.py
Add docs on how to switch backend serialisers.
Note limitations of JSON backend
removed tests with null elements
removed tests with illegal values
typo
removed try-except from where they should not be placed