center new floating windows - center any window with a shortcut
monocle layout and single windows with borders
useless gaps around windows for all layout modes
merge branch monocleborders
merge branch uselessgaps

Conflicts:
	monsterwm.c
added initial config.h
updated config.h
    modified default options
    added windows rules
    set urxvtc as default term
    set tewi as default font in dmenu_run
    modified keyboard and mouse shortcuts