installed "configurable docs"
(squash all RTD bugfix commits)
attempt to fix RTD issues: remove -e in front of astropy repo path

Reverted use of configurable logo for testing RTD

attempt to use @eteq's build-ext fix branch

try/except around import coords, EVEN THOUGH it's mocked out

revert to astropy/master which now has #725 incorporated

now back to @kbarbary's configurable-logo

tried adding kbarbary's branch to pip-requirements