support for build artifact upload to a remote server

.travis.sh

@@ -3,5 +3,26 @@
 if [ $RUNTESTS ] ; then
 	cd ./src/test && make test
 else
-	make -j2
+	if [ $PUBLISH_URL ] ; then
+
+		make -j2
+
+		TARGET_FILE=obj/cleanflight_${TARGET}
+
+		if [ -f ${TARGET_FILE}.bin ];
+                then
+                        TARGET_FILE=${TARGET_FILE}.bin
+		elif [ -f ${TARGET_FILE}.hex ];
+                then
+                        TARGET_FILE=${TARGET_FILE}.hex
+		else
+			echo "build artifact (hex or bin) for ${TARGET_FILE} not found, aborting";
+			exit 1
+                fi
+	
+		curl -F file=@${TARGET_FILE} ${PUBLISH_URL}
+	else
+		make -j2
+	fi
+
 fi

docs/development/Travis.md

@@ -0,0 +1,10 @@
+#Travis
+
+Cleanflight provides Travis build and config files in the repository root. 
+
+## Pushing builds to a remote server
+
+```.travis.sh``` script can upload build artifacts to a remote server. This feature is controlled by the
+```PUBLISH_URL``` environment variable. If set, the build script will use the cURL binary and simulate
+a file upload post to the configured server.
+