a thorough cleanup and restructuring
fixing up the documentation
implemented fitting and extinction
added documentation for fitting
added astropy to rtd-pip-requirements
changed the conf.py to specgrid
changed the conf.py to specgrid - once more
added version mechanism to specgrid
added _astropy_init.py
greatly simplified spectralgrid
rename spectra->fluxes
fluxes.unit -> flux.unit
making dataset into numpy array
Merge pull request #2 from wkerzendorf/grid/simplify

Grid/simplify
"Fix for BaseSpectralGrid parameter issue"
"Fixed an issue with the Interpolate output: Changed 'interpolated_flux * self.observed.flux' to 'interpolated_flux'"
Merge pull request #3 from nwwinsor/simplify2

"Fix for BaseSpectralGrid parameter issue"
Added a new test for convolve.
"I have added a new Convolve plugin to plugins.py , and I have also a new test for this Convolve plugin."
"I have added Convolve and Normalization plugins, as well as tests for these plugins."