Basic focus/blurr support

Still has bugs and it's ugly.
Fixed focus on new workspace
Removed debug g_printf - s
Fix a potential destroy of a destroyed GTK widget.

Any item in workspaces->buttons should be set to NULL after the
corresponding workspace is destroyed.
Bold the focused workspace.
Merge pull request #1 from xuhdev/null-button

Fix a potential destroy of a destroyed GTK widget.
Merge branch 'bold-focus' of https://github.com/xuhdev/xfce4-i3-workspaces-plugin into xuhdev-bold-focus
Added .gitignore entries for Autotools generated files
Bold the focused workspace.
Merge branch 'master' into develop

Conflicts:
	panel-plugin/i3w-plugin.c
Merge branch 'bold-focus' of https://github.com/xuhdev/xfce4-i3-workspaces-plugin into xuhdev-bold-focus

Conflicts:
	panel-plugin/i3w-plugin.c
Merge branch 'develop' into xuhdev-bold-focus

Conflicts:
	panel-plugin/i3w-plugin.c
	panel-plugin/i3wm-delegate.c
Fixed the scratch workspace crash
Updated README.md
Update README.md
Added click support
Removed debug code, replaced snprintf with sprintf
Merge branch 'develop'
Updated README.md