Add info about a specific Sphinx version check.
Replace development build with stable now that astropy 0.4 is out

Closes #65
Merge pull request #92 from mwcraig/update-for-apy-0.4

Replace development astropy with stable astropy for the test coverage case
Merge pull request #88 from mdboom/docs/do-sphinx-version-check-ourselves

Add info about a specific Sphinx version check.
Add a few entries to .gitignore
explain readthedocs

add released versions of astropy-helper and astropy to rtd-requirements
Merge pull request #78 from hamogu/rtd

example file for readthedocs
Merge pull request #97 from cdeil/gitignore-additions

Add a few entries to .gitignore
removed empty init
switch to using the packagename directory (will rename in next commit)
packagename->halotools
back to original conf.py
Merge remote-tracking branch 'pkgtempl/master' into merge
Implemented Erik's fix to the package-template. Sphinx works now.