Fix utils test suite errors
Fix assert
Remove unused import
Merge pull request #322 from passy/utils-assert

Fix utils test suite errors
Use _compat.urlparse.quote
Use explicit field name in .format() string
Add assert methods missing on 2.6
Merge pull request #323 from untitaker/sprint-branch

@mitsuhiko, i am taking you at your word
Fixed testsuites for datastructures