opengraph POC

Fixed small-frame opengraph view

Fixed incompletely saved OpenGraphCache bug
Added opengraph content to mood page
Improved opengraph data display

Style fixup
Replaced opengraph with opengraph_parser

Code style fixes
Og info appears only if oembed isn't available
Load og data faster (after_save -> after_commit)
Code style fixes, removed unneeded rescue
rspec test for GatherOpenGraphData worker

Added rspec test for og in status_message model

Added rspec test for og_html helper

Improved tests for opengraph embedding
Opengraph to mobile view
Only parse opengraph if oembed is not available