Use Ceylon SDK 1.1

Following ceylon/ceylon-sdk#219.
Bump version to 1.1.0

Closes #46.
Add --help and --version options

To get --help you need to use -- --help because of
ceylon/ceylon-common#38.
Add equals, hash to the IndentModes

For testing
Add test for IndentMode
Parse Mixed indent mode with swapped tabs, spaces

Allows “mix m spaces, n-wide tabs” in addition to “mix n-wide tabs, m spaces”.
Fix missing word in assertion message
Work around compiler restriction

Closes #47.
Format self

I temporarily couldn’t format the code because of #47, and these changes
snuck in. Gah!
Change version to 1.1.0-BETA
Add published module