backfill test about respecting gemspecs with multiple licenses

And remove some stubbing.
better test description
remove dead code
backfill basic tests about how packages behave
extract package homepage from npm, if available
extract package homepage from pypi, if available
extract package homepage from bower, if available
Merge pull request #70 from mainej/homepages-from-npm-pip-bower

Extract homepages from npm, pip, and bower