Fix lint & test errors

[remko]

Fixes #139 and #140

Mostly fixing this so someone can approve the other critical PRs ( such as #147 )

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[codecov]

Codecov Report

Merging #150 into master will decrease coverage by 0.99%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master     #150    +/-   ##
========================================
- Coverage   95.81%   94.82%    -1%     
========================================
  Files          17       16     -1     
  Lines        1818     1604   -214     
  Branches      274      252    -22     
========================================
- Hits         1742     1521   -221     
- Misses         19       33    +14     
+ Partials       57       50     -7

Impacted Files	Coverage Δ
webapp2_extras/auth.py	96.85% <ø> (ø)	⬆️
webapp2_extras/sessions.py	96.37% <ø> (ø)	⬆️
webapp2_extras/appengine/sessions_memcache.py	94.11% <ø> (ø)	⬆️
webapp2.py	92.86% <ø> (-2.63%)	⬇️
webapp2_extras/routes.py	92.06% <ø> (ø)	⬆️
webapp2_extras/appengine/sessions_ndb.py	94.59% <100%> (ø)	⬆️
tests/resources/i18n.py

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