fix retrieving errors from the thread

because isRunning() will return false if there are
errors in the thread, we were never getting into
the function that tried to retrieve errors
don't hang the loader if it's never given any resources to load

previously, if there were never any resources passed to the loader
resourceBeingLoaded wouldn't be set and pending would never have
anything in it so the thread would never terminate

this implementation requires a final update call after all resources
have been loaded
Merge pull request #5 from TannerRogalsky/fixes

Fixes
bumping version to 2.0.1
Always use "/". Fixes #10
Merge branch 'master' of github.com:kikito/love-loader