Spelling fixes (cosmetic)

A few typos in comments and protocol docs, no code changes.

./src/wayland-util.h:281: recieved  ==> received
./src/wayland-client.c:115: occured  ==> occurred
./src/wayland-client.c:156: occured  ==> occurred
./tests/test-compositor.c:76: parallely  ==> parallelly
./tests/test-compositor.c:474: recieve  ==> receive
./protocol/wayland.xml:1767: layed  ==> laid
./protocol/wayland.xml:2112: dependant  ==> dependent
./doc/publican/sources/Client.xml:25: recieved  ==> received

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Bill Spitzak <spitzak@gmail.com>