FIXED - task 60: Add ability to fail a Concordion suite with @FailFast 
http://code.google.com/p/concordion/issues/detail?id=60
Added sequence diagrams for fail-fast
Update FailFast.svg

Removed doctype from SVG diagram
FIXED - task 64: Add support for different file extensions
http://code.google.com/p/concordion/issues/detail?id=64
renamed new method on Target interface
Reverted change that broke gradle test
[Gradle Release Plugin] - pre tag commit:  '1.4.4'.
[Gradle Release Plugin] - new version commit:  '1.4.5-SNAPSHOT'.
Added new extension spec to Extensions.html