Merge pull request #35 from Nodeclipse/master

optional Maven/Tycho build; 100% ready for Travis CI
Add missing categoryId to "show in file manager" action. Closes #33.
Provide command set for Mate. Closes #34.
URL handling (closes #28, I think, but need to do a bit more testing,
especially on windows)
Update
Auto-detect Linux MATE (closes #34)
Change log up
Update
Update help
Release 1.5.0
Release 1.5.0
Update poms for 1.5.0
Update README.markdown

1.5.0 already published, so not "upcoming".
More tasks for release
Merge pull request #1 from basti1302/master

update