Switch to Astropy for logger and for FITS I/O
Added integrate.py
Added interpolate.py
Added tests for sources and converted to properties
Added from_dict and round-tripping tests
Now require ``get_log_fluxes`` to be dynamically called instead of storing these inside the Source object.
Test the get_log_fluxes method
Remove unused function
Renamed read_ascii to from_ascii and made it a class method
Tidied up to_ascii/from_ascii
Re-factored extinction.py
Added tests for Extinction
Removed dependency on ATpy in ConvolvedFluxes
Merge remote-tracking branch 'template/master' into refactor

Conflicts:
	.gitignore
	setup.py
Tidying up after merge with Astropy package template
Fixed pickle import for Python 3
Added round-tripping test for source ASCII conversion
Changed Models.read to a class method
Added initial tests for convolved fluxes
Merge remote-tracking branch 'template/master' into refactor

Conflicts:
	setup.py