Fix remaining references to ``wav, fnu = m.get_sed`` and similar notation. Fixes #49.
Improvements to docstrings and documentation
Renamed ``flux`` attribute to ``val`` since it can also be flux densities, surface brightness, and polarization.
Small improvement to docs
Fixed remaining references to ``flux``
Updated get_sed API in tutorial examples
Added cross-references
Merge pull request #51 from astrofrog/fix-get-api

Fix remaining references to old API for ``get_sed`` and ``get_image``