Merge pull request #368 from segmentio/update/readme

update readme
bumping store.js dep to 2.0.0

Previously was tagged at a non-component version.
Release 2.0.1
make-test: make sure we use the correct phantomjs(1)
Merge pull request #369 from segmentio/fix/phantom

make-test: make sure we use the correct phantomjs(1)
update readme