Remove JasmineRunnerController example test

Failing test generated with package.
Capture `atom.workspace` as an instance variable in JasmineRunnerController
Add example Jasmine tests as fixtures

These are here to be used as test data in tests. However, they are
valid tests and do run, which is useful to ensure that I’m testing this
package with valid tests.
Add basic File class

Right now, it just gets the lines from the start of the editor to where
the cursor is.
Add Line class

Wraps a `TokenizedLine` from an editor. Wrapped so that we can offer
additional functionality and to insulate this package from changes to
the api - i.e. if the api for `TokenizedLine` ever changes, we only
have to change things in one place.
Use our Line class in our File class
Remove debugger statement

Should never have been committed
Use `tokenizedLinesForScreenRows` instead of `linesForScreenRows`

Fixes deprecation warnings.