minor README update
minor README update

- clarifies how to run the tests via your browser
- cleans up a few small typos/grammar etc.

benkeen/couchdb-fauxton,popojargo/couchdb-fauxton,popojargo/couchdb-fauxton,robertkowalski/couchdb-fauxton,michellephung/couchdb-fauxton,michellephung/couchdb-fauxton,apache/couchdb-fauxton,garrensmith/couchdb-fauxton,apache/couchdb-fauxton,benkeen/couchdb-fauxton,robertkowalski/couchdb-fauxton,cloudant/couchdb-fauxton,garrensmith/couchdb-fauxton,apache/couchdb-fauxton,michellephung/couchdb-fauxton,robertkowalski/couchdb-fauxton,popojargo/couchdb-fauxton,cloudant/couchdb-fauxton,cloudant/couchdb-fauxton,robertkowalski/couchdb-fauxton,apache/couchdb-fauxton,benkeen/couchdb-fauxton,cloudant/couchdb-fauxton,popojargo/couchdb-fauxton,garrensmith/couchdb-fauxton,garrensmith/couchdb-fauxton,michellephung/couchdb-fauxton,michellephung/couchdb-fauxton