added helper function for saving Gecko prefs
Revert "added helper function for saving Gecko prefs"

This reverts commit 35e4dbb5b35164affb42d00f16166521a52faa87.
Merge branch 'master' of https://github.com/laurentj/slimerjs
added onConsoleMessage documentation
Merge pull request #203 from hallvors/docfix

Docfix: add text for onConsoleMessage