Put in cloning for T3-1123

git-svn-id: http://taverna.googlecode.com/svn/taverna/engine/net.sf.taverna.t2.activities/branches/maintenance/external-tool-activity@17033 bf327186-88b3-11dd-a302-d386e5130c1c
Added gitignore
Added README
Merge branch 'hotfix' into maintenance
Merge branch 'maintenance' into activities-1.5