Merge pull request #82 from infirit/master

Add  to ACLOCAL_AMFLAGS for user added flags
configure: Add GTK3 support
configure: About me capplet is always built now
libslab: Add GTK3 support
font-viewer: Allow to compile with GTK3

However, drawing signal is disabled with GTK3. It need to be fixed later.
about-me: Add GTK3 support
accessibility: Add GTK3 support
common: Add GTK3 support
mouse: Add GTK3 support
default-applications: Add GTK3 support
keyboard: Add GTK3 support
keybindings: Add GTK3 support
appearance: Add GTK3 support
display: Add GTK3 support
windows: Add GTK3 support
Bump version to 1.7.0
appearance: Fix crash with GTK3
keyboard: Fix segfault

Var may be set as constant value but freed later.
Remove all separator occurrences
Fixes for GTK2