Updated UoW doc and implementation according to the final architecture.
Improve english.
Unnecessary line.
[wip] improve doc
Merge branch 'rewrite' of github.com:twitter/bower into rewrite
[wip] Finish Resolver doc and start PackageRepository
add resolver factory
[wip] improve package meta description
Merge branch 'rewrite' of github.com:twitter/bower into rewrite
Change UnitOfWork to Worker.
Typo.
Signal optional type.
Fix bugs in the Worker, add tests.
Use 'end' instead of 'exit' to guarantee that streams are flushed.
Move worker tests.
Small pert improv.
Small changes to the Resolver API.
Update resolver implementation according to the API, integrate bower-json package.
Add initial tests for the Resolver, fix some bugs.
Add some more tests.