Fix #13 by testing for both null and empty strings using the Groovy syntax (null and "" evaluate to false)
Upgrade to latest svnkit and add jgit
Merge branch 'master' of https://github.com/ari/gradle-release-plugin

Conflicts:
	build.gradle
Remove merge rubbish left behind
Upgrade gradle
Ignore Intellij files
Clean up some documentation, imports and variable declarations. Nothing much.