Added read class methods to all sources
Added tests for source reading and fixed bugs
More source I/O tests and fixes
Implemented use_sources
Updated changelog
Allow use_sources to read from input files
Added read methods for ImageConf
Added methods to read in the RunConf and OutputConf
Added test for OutputConf
Fully test OutputConf
Tests for ImageConf and BinnedImageConf
Tests and fixes for PeeledImageConf
Updated TODO
Tests for RunConf
Made a few fixes because of the fact RunConf can't use class methods for reading/writing since it is a mixing class.
Minor fix to FreezableClass
Use RunConf.__init__ instead of RunConf.init_run_conf
Added test for monochromatic I/O
Added ``use`` methods for using previous runtime, image, and output parameters
Updated URL for zlib (new URL will be future-proof, as opposed to the old one which breaks every time a version is released)