Docker FROM AS syntax

Adding support for FROM x As y syntax, thanks to @xamgore.

Improved Dockerfile support and new .dockerignore support

Thanks to @mishak87 @dsifford @adius @cnichols @ph-One this release features new keyword highlighting (shell and healthcheck), case-insensitive highlighting, highlighting of newline escapes, an improved readme, and support for .dockerignore files.

Docker v1.9 changes

v1.1.6

Bump version for Docker v1.9 changes

v1.1.3

Remove deprecations

v1.1.2 Release

Bump version