Add __init__.py and __all__ to fermilat package
Rename fermilat package to fermi

It's simpler and there are two detectors on Fermi:
LAT and GBM and eventually we want to access data from both.
Add missing self in FermiLAT_DelayedQuery
Add fermi package to the docs
Add a test for the Fermi query
Fix in FermiLAT_Query: use results._content, not results
Update Fermi unit test and docs with better example.
Merge pull request #3 from cdeil/fermilat

Some additions / cleanup for Fermi LAT