Doumentation cleanup. Filled in recent history
cleaned up column documentation
document the logLevel attribute on the ant tasks
Merge branch 'columnDocUpdate' of https://github.com/SteveDonie/liquibase.github.com

Conflicts:
	about.md
Merge pull request #17 from SteveDonie/master

Doumentation cleanup. Filled in recent history
Fixed issues with new jekyll version
Merge remote-tracking branch 'origin/master'
Maruku was messing up the javascript tags
New header tagline image
Added 3.1 XSD
Documented offline mode
Created 3.1 upgrade guide and updated download page for 3.1
Fixed issue #23: Tag databaseChangeLog is not closed in XML Format (v3.0)
Added note for CORE-1675
Maven docs updated for 3.1.0
Updated javadoc for 3.1.0
Updated change docs for 3.1.0