checking in browser.js to track changes which would be necesary

because it is not possible to load sym links in a chrome app https://code.google.com/p/chromium/issues/detail?id=27185 cant load a dev version of mr
using message bus to xhr files if in a chrome extension
passing messages without helper
switched to using pubsub now can load files to the sandbox fixes #1
checking in montage/core/logger.js to track changes for #2

because it is not possible to load sym links in a chrome app https://code.google.com/p/chromium/issues/detail?id=27185 cant load a dev version of montage
fixes #2 for now added a try catch around the localstorage use

since it looked like it was already optional
Merge pull request #4 from cesine/modifiedMr

Modified browser.js and logger.js