Merge pull request #96 from gtorrent/wip/sort

Sorting and searching.
graph menu is now based on arbitrary string holding intervals
add GraphIntervals option
add GtaphPreferredInterval option
Merge pull request #97 from gtorrent/wip/timed-graph

Timed Graph
add option to disable the graph grid
Merge branch 'wip/timed-graph'
Merge branch 'master' of github.com:gtorrent/gtorrent-gtk
Merge remote-tracking branch 'origin/master' into wip/looks-familiar

Conflicts:
	src/gtk/GtkGraph.cpp
	src/gtk/GtkGraph.hpp
	src/gtk/GtkSettingsDialog.hpp