added hints for cite keys when using bib files for reference management.
Merge branch 'master' of github.com:thehogfather/brackets-latex

# By Ole Kröger
# Via Ole Kröger (1) and Patrick Oladimeji (1)
* 'master' of github.com:thehogfather/brackets-latex:
  sort the keywords
fixed error when detecting bib filename from main document.