Issue #916 - challenge with Ant doc build

The "automatically transform Eclipse cheat-sheets to PDF tutorials" task has been implemented as shell script.
There are two issues:

- works on Linux only (maybe on Mac)
- require ant 1.9.4 (doesn't work with 1.9.2)
Merge pull request #918 from pecko/issue916

Issue #916 - challenge with Ant doc build
Minor tidying, to verify new build
Merge pull request #919 from debrief/verify_travis_PDF

Minor tidying, to verify new build