Version 0.0.18

• implemented multiple web-apps feature.
• implemented debugger support for multiple web-apps.
• implemented integration tests support for multiple web-apps.
• implemented gretty.afterEvaluate and farm.afterEvaluate closures for easy configuration of gretty tasks.
• implemented highly customizable gretty task classes and farm task classes.
• improved security of realmConfigFile: now it uses "${webAppDir}/WEB-INF" as a base folder, if you specify relative path.
• completely rewritten documentation.