Set of improvements and fixes #1

[ap4y]

This PR contains series of improvements and fixes for indentation and highlighting. Hope it won't be a problem merging this batch instead of groups of PRs.

Changes:

• Highlighting for attributes like @objc, @IBAction etc;
• Highlighting for self and super keyword;
• Small fix for string interpolation highlighting, it leaked outside of the interpolation expression if string contained brackets;
• Indentation for function declaration work with various attributes (previously worked only with override);
• Fixed indentation issues for types with annotations (i.e. Dictionary<String, String>);
• Improvement multi-line hash and array indentation, behaves same as in Xcode;
• Fixed indentation issues for multi-line function calls when arguments contained optional(?) or unwrap(!) literal;
• Fixed indentation issues of statements inside enum declaration.

[ap4y]

For some reason one test fails on travis. It works in my local environment, but I was able to reproduce it in ubuntu VM. I will fix it tomorrow.

[bbatsov]

@ap4y No worries; you've done a great job so far. :-)

[ap4y]

I couldn't sleep without fixing this test :) Should be sweet now.

[bbatsov]

I like your attitude towards problem-solving. :-)

Regarding the issue at hand - yes, the problem is present in ruby-mode as well, but ruby-mode starts using SMIE in 24.4 so it doesn't have to care about older smie implementation. As a lot of modes started using SMIE lately it saw a lot of improvements in 24.4.

[ap4y]

Agree, ruby-mode and this mode look way better in 24.4.