First unittests added
Merge branch 'develop' into pre-master

Conflicts:
	tests/test_solarflux.py
Adding support for the calculation of the 3.7 solar relfectance
Merge branch 'pre-master' into develop
Add one more use case to doc
Fixing for MODIS terra as well
Adding seviri reader and some more documentation
Added SEVIRI example to the docs
Improving documentation
Adding new rst files
Documenting the 3.7 reflectance derivation
Fixing bug in docs
Adding LUT option and changing reflectance module to allow reflectance
derivation of entire imager scenes
Improve the error handling in case of wrong environment
Fixing bug in docs
Doc fixes
Added doc testing.
Reading/loading data automatically and handles
dynamic loading of configuration
Merge branch 'develop' into pre-master
Added VIIRS reader.
Added blackbody radiation calculations using wave numbers
Improved relfectance code