Saving current work on django 1.6
Never cache the South migrations table.

This can be extremely confusing during local development, where the
developer may recreate their database but johnny-cache still has stale
copies of the migrations.

Fixes https://github.com/jmoiron/johnny-cache/issues/47 .
Merge pull request #49 from Wilfred/dont_cache_south_table

Never cache the South migrations table.
[Python 3] iter[keys|values|items] -> [keys|values|items]
[Python 3] print statements -> functions
[Python 3] Removes unicode 'u' for Python 3.2
Use 'is None' instead of '== None'.
Removes unused imports.
[Travis CI] Adds continuous integration, first for django 1.4 only.
[Travis CI] Adds memcached to the services & removes Python<2.6
[Travis CI] Tries to add Django 1.3
Adds a fallback for django < 1.4.2
Adds continuous integration badges.
[Travis CI] Tries to add Django 1.2
[Travis CI] Tries to add Django 1.1
[Travis CI] Removes Django 1.1 & tries to add Django 1.5
[Travis CI] Tries to add Python 3.2 & 3.3
[Travis CI] Installs python3-memcached for Python 3.
[Travis CI] Fixes syntax.
[Travis CI] Removes memcached from the default installed modules.