Merge pull request #63 from Trainxy/master

Fixed #44 of the cache updating bug in tox.application.dao.cache
Intergrated by `Ant'.
Replenished the missing `build.xml' for `Ant'.
Merge pull request #64 from snakevil/master

Intergrated by `Ant'.
Merge branch 'master' of github.com:php-tox/tox
Fixed #49: Improved the code coverage of configuration.