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"