Add use VTE titles setting in configuration panel.

Signed-off-by: Gaetan Semet <gaetan.semet@intel.com>
Merge branch 'gsemet_push_vte_title' of git://github.com/Stibbons/guake into vte-titles-ui

Pull request 171
A little bit clearer checkbox name
Add prefs UI for use_vte_titles option

Merge pull request #171 from Stibbons/gsemet_push_vte_title