Added tox.ini file with to run tests on oscar 0.4 and oscar 0.5.
Fixed template paths in extends tags.
Restored correct template paths.

Removed 'oscar/' prefix in extends tag.
Merge pull request #1
Add makefile for creating sandbox
Add coveralls support

And tidy requirements.txt.
Relocate dashboard templates...

...to be consistent with Oscar's naming conventions.
Move books fixture into fixtures/ folder
Update contributing instructions in README