MNT: Set beta status in PyPI package info

Merge pull request Unidata#396 from jrleeman/LFC_NaN

LFC and EL NaN returns

MNT: Fix deploy on Travis

MNT: Disable running examples for now.

Can't seem to solve this and need to get this merged. Will revisit.

MNT: Update notebook images (Fixes Unidata#259)

MNT: Update Travis pypi deployment for repo move.

MNT: Remove unused argument (Fixes Unidata#207)

Merge pull request Unidata#164 from dopplershift/fix-docs

Fix docs

Set up automatic Travis release deployment.

Merge pull request Unidata#78 from dopplershift/colormaps

Add some more colormaps.