chore(core): adding hightlight files
chore(core): reduce jshint errors in highlight
fix(highlight): prevent gulp breaks
chore(core): coma and typo in e2e specs
feat(highlight): highlight integration in preview
style(highlight): adding default style
feat(gulp): asynchronous and merge streams
fix(highlight): fix bug when typing not affecting the model

Closes #11.
Merge branch 'feature/highlight' into develop