Added dogpile.cache.
Merge branch 'capakey_gateway' into caching

Merging changes in capakey_gateway branch with caching branch.
Merge branch 'master' into caching
Merge branch 'master' into caching
Merge branch 'master' into caching

Conflicts solved:
	crabpy/tests/gateway/test_capakey.py
Expand caching to the complete gateway.
Merge branch 'master' into caching
Furter integration testing with caching.
Complete code coverage for capakey gateway caching.
Don't pickle the gateway.

Not a good idea to add the gateway itself to the cache. When using eg.
the dogpile dbm backend, the result returned from the creator gets
pickled. Fails horribly when the gateway is in there.
Fixed an error in capakey parsing regex.
Added example scripts for capakey gateway.

With and without caching.
Ignore dogpile caching dir.
Add some docs about caching.
Fix travis error with setuptools.
Remove dependency for userdigesttoken.

Has the advantage of having a specialised version for dealing with the
timestamp microseconds weirdness.
Add python 3.2 to tox.
Get rid of raw_nonce.
Unit tests for wsse.py
Make python 3 compatible.