added state parameter for FB.getLoginUrl
ask publish_actions seperately
output raw error if publish_actions fails
Merge pull request #38 from Thuzi/best-practices

separate read/publish permissions and state in getLoginUrl
updatred version to v0.6.0
fixed impression
updated version to v0.6.1
added author and license info in readme
added instrumentation notice in readme
updated version to v0.6.2