Add --trivial option for trivial changes.

This one causes sunrise-commit to not update the ChangeLog on a trivial
change (e.g. a Manifest fix).

sunrise-commit

@@ -113,13 +113,14 @@ Options:
 
 	-c, --changelog		backwards compat (ignored),
 	-C, --nocolor		disable colorful output,
+	-t, --trivial		trivial changes (do not add a ChangeLog entry),
 	-v, --verbose		enable verbose output.
 _EOH_
 }
 
 # Guess what!
 main() {
-	local commitmsg monochrome
+	local commitmsg monochrome trivial
 	unset SC_VERBOSE
 
 	while [ ${#} -gt 0 ]; do
@@ -139,6 +140,9 @@ main() {
 			-C|--nocolor)
 				monochrome=1
 				;;
+			-t|--trivial)
+				trivial=1
+				;;
 			-v|--verbose)
 				SC_VERBOSE=1
 				;;
@@ -194,13 +198,18 @@ main() {
 				bns=$(echo "${commitmsg}" | grep -o -E '[0-9]{4,}')
 
 				# Creating a new ChangeLog? Let's take a look at the commit message.
-				[ ! -f ChangeLog -a -z "${bns}" ] && die 'Please supply the bug number in the initial commit message!'
+				if [ ! -f ChangeLog ]; then
+					[ -n "${trivial}" ] && die "Trivial change for an initial commit? You're joking, right?"
+					[ -z "${bns}" ] && die 'Please supply the bug number in the initial commit message!'
+				fi
 
-				sayv '...and appending to it.'
+				if [ -z "${trivial}" ]; then
-				req echangelog "${commitmsg}"
+					sayv '...and appending to it.'
+					req echangelog "${commitmsg}"
+					echo
+				fi
 
 				if [ -n "${bns}" ]; then
-					echo
 					local bn cbn
 					for bn in ${bns}; do
 						cbn=#${WHITE}${bn}${NORMAL}