Mmtf-python

Fixed
- Changing ascii to utf8 29

Fixed
- Resolve issue with get_coords

Fixed
- Resolve 22 22

Added
- Added files to manifest.in

Changed
- Classes to new style

Added
- Added pass_data_on and write_mmtf to the mmtf API
- Added API functions to MMTFDecoder to get coordinates and bonds as a single list. get_coords and get_bonds

Changed
- Refactored MMTFDecoder to seperate file

Added
- API functions to write out MMTF files
- Exposed TemplateEncoder, MMTFEncoder, write_mmtf and pass_data_on to API
- Unit test of roundtripping data
- Improved docs