add syncToNotification attribute
add syncToNotification member function
change constant generatedDomElementTag back to the non-polymer version
add basic support to render using notification-card API
change "type" in jsdoc to specific types
add support to show notifications under tabId "snapshots" (first) as well
add fake_content_script to inject testdata for testing
basic setup for menu system done; about to add create a snapshot function
save before go to bed