add isVersion to API interface
Merge remote branch 'framework/master'
Merge branch 'master' of git://github.com/ant4eclipse/ant4eclipse
Fix AE-276
Add loging info for registered JREs
AE-265 NPE no longer occurs, null return value is replaced by exception
Fix AE-278
Merge pull request #12 from laeubi/master

Some fixes and improvements