Fixes # 146
Added onkeydown trap of shift-tab/tab on first and last elements
in settings to keep focus in dialog until closed.
Fixes #166
Added aria-labbelledby to the grouped radio buttons in the
settings dialog
Added html extension to content transformation and submodule update
Fixes #63 adds the version info the epubReadingSystem object and about dialog
#63 forgot to get it working in library view. Fixed.
Merge pull request #165 from becka11y/feature/tabTrap146

Fixes # 146
Merge pull request #167 from becka11y/feature/radioLabels166

Fixes #166
Fixed the tests
Added verbose flag to grunt task to debug travis
Added stack flag to grunt task to debug travis
travis debugging
Attempt to fix travis problem