missed sendRequests that broke site interaction
Merge pull request #54 from jsterken/unbreak_everything

missed sendRequests that broke site interaction
Migration of settings from localStorage to chrome.storage.sync
chrome.extension.onMessage listener needs to return true when it expects to receive a response after the function has returned.
Bugfix: Newznab: change SAB icon to fetching onclick
Improvement: Added category for nzbx.co one-click
Updating README: alphabetic ordering & added 'Any Newznab-based indexer'
Removed dead sites: nzb.su and mysterbin.com