Added a List method for listing the contents of a FileStore.

Signed-off-by: Gary Belcher <gary.belcher@clicktravel.com>
Added missing Javadoc to new FileStore methods.

Signed-off-by: Gary Belcher <gary.belcher@clicktravel.com>
Updated commit following review.

Signed-off-by: Gary Belcher <gary.belcher@clicktravel.com>
Merge pull request #19 from clicktravel-gary/master

Added a List method for listing the contents of a FileStore.
Merge branch 'master' of https://github.com/ClickTravel/Cheddar