Let customer package the JRE in the application archive
support generic variable expansion
java.home sounds better
some tests
make embedded JRE /bin executable as ZIP don't preserver posix attributes
use java-like attribute name to avoid impact on existing clickstacks
fix variable names "shell style" in javadoc
some fixes based on Cyrille's code review
Merge pull request #3 from CloudBees-community/custome-JRE-in-webapp

Let customer use custom JRE