Add options menu

Pretty trivial right now, and ugly, but should be easy to extend.
Viewable in Tools > Options > Visual Rust.

Closes #1
Merge branch 'master' of https://github.com/cmr/VisualRust.git
Provide a basic language service

This puts us in the "Text Editor" settings page, so remove the hacky Options page.
Add smart indenting

This is still a bit bad, but it *basically* works.

Closes #2
Add waffle board
add waffle.io badge
Merge pull request #15 from waffle-iron/master

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