Update schema to use toggle shell script

Fixes https://github.com/mate-desktop/mate-settings-daemon/issues/32
housekeeping: Support new thumbnails path for newer glib versions

Closes #51
https://github.com/mate-desktop/mate-settings-daemon/issues/51
Silence autofoo warning
INCLUDES -> AM_CPPFLAGS
Add dist-hook for auto Changelog generation
Sync translations with transifex
Sync translations with transifex
Bump version to 1.7.0