add overplot 'o' key in mapplot
clean up ammonia docstring and variable names
fix typo in ammonia
fix template fitter: had been missing key components
fix issues with template fitter: models cannot include *any* NaN values

(it is possible to modify the fitter to ignore NaN values with an n(dof)
value that varies depending on the overlap between the template and the
model, but that modification is nontrivial and could result in a
significant performance hit for non-template fitters.  It is also
somewhat statistically questionable)
add template tests: at s/n ~ 100, the tests should recover the input
parameters to 2 decimals
add test init for template model test
include unit tests in test running

This is a terrible hack; the entire testing system needs to be revamped.
Merge branch 'master' of github.com:pyspeckit/pyspeckit