Added support for PrivateModules in the JukitoRunner

JukitoRunner builds a collection of bindings that
it uses to determine whether a injection should be
fulfilled by Guice or by Mockito. This change
allows only the exposed Keys from PrivateModules
to be added to the collection, thus preventing
a mock object from being created when it shouldn't
be.
Fixed a bug where the timezone for the SimpleDateFormatter
was not set. This caused a periodic failure depending
on when it was compiled.
Fixed the style errors in the previous commit.
Merge pull request #40 from diamondq/master

Added support for PrivateModules in the JukitoRunner