doc changes to T alias for planet / star
Merge commit 'aa799dc0719a212d76a11dc8d75897f4e10913ed' into develop
travis.ci setup
changed unit test structure (relative imports)
changed discover test method from nose to native unittest
Revert "changed unit test structure (relative imports)"

This reverts commit f731bb94b523a00b5dc529a2f7fc394c6934bba8.
more relative import changes
more relative import changes
more relative import changes
fixed / skipped unit tests
changed aserrtequal to almost equal for float test on sun
code looks for mol weight tag before assuming
initial port over of limb darkening search code
modifications limb darkening lookup to work with OECPy
modified limb_darkening code to require a wavelength not a wlgrid and added some test code to example
prefixed functions with their modules
find nearest code
limb darkening code runs but without validation
tidy limb darkening code
lookup works but find nearest seems wrong