Annotate `this.$get` function in providers

[BinaryMuse]

Hi, Brian,

This pull request annotates this.$get = function(dep) in providers (#31). From the test, it transforms:

angular.module('myMod', []).
  provider('myService', function (dep) {
    this.$get = function(otherDep) {};
  });

into this:

angular.module('myMod', []).provider('myService', [
  'dep',
  function (dep) {
    this.$get = ['otherDep', function(otherDep) {}];
  }
]);

It's based of the DDO annotation code in lib/annotate-ast.js. I've also included some refactoring in that file that extracts repeated code from inside the final deepApplys into a function annotateInjectables (I'll let you decide on a decent name :) that takes the argument usually named originalFn and returns the ArrayExpression it should be replaced with (or else returns originalFn if nothing is to be annotated).

[BinaryMuse]

angular/angularjs-batarang#66 made me realize that there was a hole in the support for $get in providers when the provider definition was provided as an object literal; this commit adds that support.

[btford]

Looks good! Thanks @BinaryMuse.

[btford]

Landed as a91b8fdf1eefb159311badb0861715ba999be9e5, 13bf914830216aa1a3da2937f9a9617cecf21404, and a2b79a5b4331c4d72674341fc1c5d1b3a93868dc. Published in v0.3.7, which is now available on npm. Thanks again, @BinaryMuse!