Created find_module helper to handle compatibility with python 3.3
Moved package checking logic in follow_str function

Created find_module compatibility helper method

Conditional implementation of load_module for python 3.3
Fixed follow_definition test
Fixed caching issues

Fixed exception raised during cache reading

Switched cache hashing to hashlib

In python 3.3 the hash function is returning different hashes during
different executions of the application.
Simplified code for readability

Splitted import compatibility function definition for better readability

Simplified code for python 3.3 load_module implementation
Adding python 3.3 to test environment, mani fixes
Added python 3.3 to test-suite

Removed unused import

Removed unused import

Migrated to EAFP for attribute checking

Bumped version of ModulePickling for migration to hashlib

Added py33 environment to tox

Fixed issue with package importing on python 3.3
Using PathFinder rather than find_loader to correctly handle paths

Using PathFinder rather than find_loader to correctly handle from ... import ...

Moved away from find_loader in favour of PathFinder also when using sys.path
Making it nicer
Fixed typo in docstring and added some comments in find_module_py33

Removed a test that is not compatible with python 3.3

Better variable names in find_module implementation(s)

Removed variable assignation in favor of direct return statement
Merge pull request #187 from Astrac/python-3.3

Python 3.3