Add option to set arbitrary window name

Added main() level scoped char* to hold title. Added a GOptionEntry
for grabbing the title with a switch. If the switch is given we
force dynamic title to be false and don't connect vte window title
change signal to top level window change. That is all folks.

Signed-off-by: numeral <numerical@gmail.com>
Merge pull request #93 from numerical/titleflag

Add option to set arbitrary window name