Readme updates
Extend extensions for App shell task
readme
Travis: Attempt testing against multiple JDKs
Fix missing wrapper jar
Readme cleanup
ignore other gradlew versions
Codenarced
Better check of start parameters
avoid internal API
JUnit4 style test
Configurable Groovy Version
rename buildShell buildDevShell, to make room for Buildshell
Extract AppTask generic functionality into ShellTask
also gradle into default vars
BuildShell task (untested)
Travis with multiple gradle versions
More tests for applicationShell task
gradle version configurable for BuildShell
missing gradle wrappers