Typescript support for generator-angular

* generate parts of Gruntfile.js, gitignore based on selected language
* set language in package.json for subgenerators to reference
  (for subsequent runs of the subgenerators)
* passing user choices to subgenerators (for the initial run
  of the subgenerators hooked from the main generator)
* reformatting of lodash conditionals that reads clearer yet still
  preserves whitespace
* overrideable configs templates (for things like backend URLs)
* template partials preloaded for dist
* controller and service generators

FUTURE WORK
* filter and directive generators
* ask user for top level module name
* revving of templates.js (with hopefully an elegant solution to the
  two pass problem)

NOTES

I could not find the intended way to pass user choices down to the
subgenerators that are hooked from the main generator. The pattern for
processing user choices seems to be setting the values on the generator
object itself, which are then made available in the template using,
presumably, a with block. To follow this pattern for subgenerators, I
needed a struct with user choices to be available in the constructor of
the subgenerator. Using the options-options during hook registration,
with a by-reference object in it that later gets populated with user
data, was the only way I could manage it.

It is conceivable that using this.env.options is the idiomatic way, and
it has one benefit of not differentiating where the choice comes from,
question-answer session with the user, or cli arguments. The problem
with it, though, is that it completely obscures data flow through the
program, and makes it impossible to trace where values are coming from.
I am a strong proponent of explicit data flow.

Also reformatted _bower.json so that the conditional expression appears
on the same line as what is being conditionaly included, while still
preserving the white space properties (i.e. no empty newlines are added
for false conditions).