* Added ability to specify overwrite behaviour when downloading media
* Added helper for redownloading media items
* renamed media redownload worker to disambiguate it from similarly named methods
* Added new redownload option to source actions dropdown
* Refactored MediaQuery to use a __using__ macro
* docs
* Adds method to improve cleanup of empty directories
* resolved bug where source metadata worker could call itself in an infinite loop
* Refactored file deletion for media items
* Removed useless filesystem data worker
* Updated task listing fns to take a record directly
* Refactored the way I call workers
* Improved some tests
* [WIP] break out a few contexts, start refactoring fast index modules
* [WIP] more contexts, this time around slow indexing and downloads
* [WIP] got all tests passing
* [WIP] Added moduledocs
* Built a genserver to rename old jobs on boot
* Added a module naming check; moved things around
* Fixed specs
Kieran