Adding sunrise/set precision discussion in FAQ, tests against MMTO

Update docs with NASA Exoplanet Archive

IERS mirror fix + mpl testing fix

# This is the 1st commit message:

Removing reference to IERS update at docs build

# This is the...

Update CI to get Travis working

Delete Appveyor testing and its badge. Repo admin needs to tell Appveyor to skip testing if the ...

Add GalacticLatitudeConstraint

Add `GalacticLatitudeConstraint` to constrain the galactic
latitudes of targets. This can be use...

Working on testing fix, removing py2.7

Update astropy-helpers to v2.0.10

Fix typo in sun separation constraint docs

plot_altitude(): set correct ylabel

when airmass_yaxis=True is used

minor: correct y-label axis for altitude

Removing windows py2 support

Updating astropy_helpers to 2.0.8

Fixing docs on moon_phase

Fix issue #385

Remove obsolete frac option from set_thetagrids

This keyword argument was deprecated in Matplotlib 2.1.0 and
removed in Matplotlib 3.0.0.

Using explicit imports to fix pytest 3.7+ issue

local time bugfix

Fix docstring for `observer.sun_altaz`

Adding missing import for example

Duck typing for @ehneilsen

add tests for priority scheduler with short eclipses

Fix error in to_table()

I am using astropy 3.0.1 and numpy 1.14.3. Without this patch,
`schedule.to_table()` produces th...

Adding docs and plot_altitude function. closes #362, closes #363 and closes #364.

Cleanup the matrix a bit and remove nose as we don't use it anywhere

Adding citation bibtex entry

At the suggestion of @arfon at #pyastro18.

Use consistent formatting for time representation (ISO)

Update astropy-helpers to v2.0.6

Deleted unused import of get_sun

Correcting spelling of Maunakea

Fix test failure due to time comparisons

Fix doctest failures on new numpys

Have observability_table accept scalar time

closes #342

Support calling plot_airmass with an empty target list

It will still set up the axes, add the brightness shading if
requested, and return the axes.

update pyephem import