Deploy v2.2.0

Fix for contentView nullable; publish v2.1.5

Fixes #102

Publish v2.1.4

ARC notice is smelling a little moldy

Merge pull request #79 from mapbox/1ec5-pedantry

Resolved pedantic warnings; fixed Retina images

Publish v2.1.1; update podspec

Merge branch 'pr/76'

Adds support for `contentViewInset`, `anchorHeight`, and `anchorMargin`
properties.

Version bump to 2.0.3

Update podspec

Merge pull request #60 from olicarbo/upstream

Remove content view subviews when rebuilding subviewviews