Encode the PK under the base 36
The shortlink view decode the PK i base 36
Handle base36 token
Add a "e" prefix to avoid issue when reaching the ID 46656
Fix the tests
Do not use xrange for Python 3 compatibility
Another Python 3 compatibility fix
Revert "Fix the tests"

This reverts commit a9dd8ced765eef34ac34f640d13ca01c40db7426.
Revert "Add a "e" prefix to avoid issue when reaching the ID 46656"

This reverts commit e730c552c0b6095a8962f29a114069fb335d7ec6.
Remove useless coma
Using uppercase is less problematic, when including directly the blog under / to avoid clash with other URLs like /admin/
Preparing tests for the default URL shortener backend
Cover the default backend for the URL shortener
Test the default URL shortener backend
Updating the number of tests done
Add note about the limitations of the default URL shortener backend
Do not use a lmabda for base36 function
Merge branch 'feature/fix-url-shortener-pattern-339' into develop, close #339