Updates .d.ts
Code changes:

- transparently wraps grunt such that the exact same API is exposed
  (wrapper can be a drop-in replacement for original grunt object)
- offers option to monkey-patch API onto original grunt object
- bugfixes, other stuff.  It's early in development so I don't feel guilty
  omitting a full changelog.
Updates Gruntfile.js
Adds README (still WIP but good enough for now)
Adds empty tests file.  Will write tests later
0.1.0
Updates README
0.1.1