Add support for top-level Jasmine functions in JavaScript

[jasonrudolph]

We already support Jasmine functions for CoffeeScript. With the changes in this pull request, we bring that same support to JavaScript.

Specifically, symbols-view will identify the following items as functions:

• describe blocks
• it blocks
• focused it blocks (e.g., fit, ffit, fffit, etc.)
• focused describe blocks (e.g., fdescribe, ffdescribe, fffdescribe, etc.)
• disabled it blocks (i.e., xit)
• disabled describe blocks (i.e., xdescribe)

Demo

We can try this out inside symbol-views very own specs. (So meta.) Let's start by editing spec/symbols-view-spec.js in Atom:

Before the changes in this PR, the symbols view only identifies a single function:

After the changes in this PR, the symbols view kindly identifies Jasmine components: