core and utils docstrings
accept quantities or array, store quantities
fix tests to compare values, not quantities
use quantities in ElectronOZM synchrotron

finish ElectronOZM conversion
ProtonOZM quantities implementation
fix examples
start quaintity implementation in plot.py
more quantities, use validator on inputs, extend tests

add validator functions
docstring fixes
core and utils docstrings

Conflicts:
	gammafit/core.py
quantities in plots

calls to matplotlib still blow up because it tries to convert the units.

fix calls to matplotlib with Quantity arguments
add new travis.yml file based on miniconda to test plotting correctly

update coveragerc

remove py3.2 from travis, no conda packages available

remove egg_info, np1.5 from travis

improve coverage, fix 2.6 and 3.x errors
do not try to sanitize model units in generate_diagnostic_plots

increase test coverage for diagnostic plots
add ULs to tests
remove envelope plotting
update examples
fix function fit test, add ULs
move validator, skip plot tests if matplotlib not present

add extern __init__.py
change coveragerc to exclude extern
Merge pull request #20 from zblz/quantities

Use astropy.unit.Quantity throughout gammafit