Add functionality to pull JS Errors into quickfix

WebSocket connection now uses a JSON-Based message protocol
Don't repeat error messages in quickfix (count them instead)
Merge branch 'master' of https://github.com/jaxbot/browserlink.vim into ohle
fix errorformat
Add command BLClearErrors and fix translations of file-URLs
update Readme
fix whitespace
Merge pull request #24 from ohle/master

Record javascript errors and make them available in the quickfix list