Added partial OpenGraph tag injection
Added OpenGraph URL tag injection
Added more OpenGraph tags and <head /> prefix

Done with OpenGraph stuff (for now)
Fixed asset_id nonpopulation

Added in default values for attribs, access and metadata columns; Joomla
may not save a row in #__assets without these values.
Updating version number

Updating version number to 0.9.
Added content sanitization for OpenGraph tags

By default, OpenGraph tags are run through trim() and htmlspecialchars()
before being sent to display.
Updating plugin version number

Updating braftoncron version number to 0.2.0.
Merge pull request #5 from ContentLEAD/dev-0.9

Merging in dev changes for v0.9