Feature for 1.2.6

[saladinkzn]

• [x] New scanner for jdk 7+
• [x] Fix for: https://github.com/akhikhl/gretty/issues/239
• [x] Fix for: https://github.com/akhikhl/gretty/issues/195
• [x] Support overlays for war webapps in farms #4
• [x] Update jetty to 9.3 (by providing separate 'container' because latest jetty 9.3. compiled with jdk 8)
• [x] Add support for inserting paths before application output folders (will fix #6)
• [x] Add support for dependencies option in farm webapp configuration. #13
• [x] Fix for https://github.com/akhikhl/gretty/issues/262
• [x] Fix for duplicate entries in getResources(path) in tomcat 7 and 8 #20