explicitly pass registry to prototype.request
less noisy tests
add happy-path tests for remaining API calls
pull registry config a level out (WIP)
test/fixtures/server.js -> test/lib/server.js

While I was at it, standardized imports and moved everything to use
double quotes.
Add test for bugs endpoint.
rename test/basic.js to reflect what it exercises
actually test lib/stars.js

...and assert that the required callback is there.
switch API to use URLs instead of names
deal with npm:// URLs
simplify .get()
fix fetching of /-/all
fail on legacy package names more usefully
updated docs to match new API
explicitly pass in registry (#46)