chore(gen-docs.js): expose dgeni as a command line tool via npm

Closes #97
fix(gen-docs.js): `startsWith()` is not ES5 compatible

This was leftover from when we were using es6-shim in dgeni. Now that has
gone we must go back to using `indexOf()` instead.

Closes #97
feat(Dgeni): add `configureInjector` method

This change helps to support easier unit testing of Packages where you
may wish to get the injector to instantiate a service or processor for
you without actually running any processing.
Merge pull request #1 from angular/master

update