adding function for calculating virial quantities
minor changes
minor tweaks
add virial test
Merge branch 'master' into v0.3dev

* master:
  Merge branches 'master' and 'v0.3dev'
bug fix
virial function restructuring
add WISE filters
Add mid IR templates from Assef 10, and the COS FUV QSO composite from Shull et al. 2012
update UV QSO composite spectrum to use that from Shull et al. 2012
bug fix
bug fix
bugfix
fix Assef10 templates to be flambda instead of fnu
fix bug in way extinction was being applied in sed.py, clean up sed.py to clarify f_nu-f_lambda conversions, add tests for new sed functions add extrapolation to MW extinction law
change units for blackbody_lam
doc tweaks
make auto-doc generation more robust
update the doc script
Extinction overhaul with API changes, move some routines from spec to sed and convolve, alter DLA generating routine, add a plotting routine to plot ticks