Fix jinjaext compatibility with Python 3.

Patch by Arfrever.

Fixes: https://github.com/mitsuhiko/jinja2/issues/115
fix typo swtich -> switch
correct typo
Fixed an issue about urlize function

When URL startswith 'https://', the return is wrong.
Before:

    >>> urlize('https://github.com/')
    u'<a href="http://https://github.com/">https://github.com/</a>'
After:

    >>> urlize('https://github.com/')
    u'<a href="https://github.com/">https://github.com/</a>'
Correct typo in dictsort filter documentation
Merge pull request #195 from vergenzt/master

Correct typo in dictsort filter documentation
Merge pull request #193 from mozillazg/patch-1

Fixed an issue about urlize function
Merge pull request #187 from jet-sun/patch-1

correct typo
Pessimistic locking for LRU cache.  This fixes #8
Merge pull request #171 from mgorny/master

Fix jinjaext compatibility with Python 3
Merge pull request #177 from sakti/patch-1

fix typo swtich -> switch