Random fixes
Fixed urls.py in py2
Fixed missing literal pref
Merge pull request #301 from passy/utils-assert

utils testsuite updated to use TestCase helpers
unicode -> six.text_type where safe
Random
Merge remote-tracking branch 'untitaker/sprint-branch' into sprint-branch
Merge pull request #302 from DasIch/unicode-text-type

unicode -> six.text_type where safe
Use chr as unichr on py3
wsgi testsuite: pep8 and testcase helpers
compat testsuite: testcase helpers
datastructures testsuite: proper asserts
Merge pull request #304 from DasIch/unichr-compat

Use chr as unichr on py3
debug testsuite: proper asserts
file -> open
test testsuite: proper asserts
Merge pull request #306 from DasIch/file-removal

file -> open
Merge pull request #305 from passy/asserts

Asserts
get rid of Headers.linked
restrict value of Headers to be unicode