Add TODO item for adding installation of shFlags, too.

Simplify the default "make" message.
diff --git a/Makefile b/Makefile
index a9f1735..3246815 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,11 @@
 GIT_EXEC_PATH=`git --exec-path 2>/dev/null || echo /usr/libexec/git-core`
 
 all:
-	@echo "There is only one target here: install"
-	@echo "This message is deliberately inserted here to prevent accidental installation."
-	@echo ""
-	@echo "Use 'make install' explicitly to install git-flow."
+	@echo "usage: make install"
+	@echo "       make uninstall"
 
 install:
+	# TODO: Add installation of shFlags to this file too
 	install -d -m 0755 $(GIT_EXEC_PATH)
 	install -m 0755 git-flow $(GIT_EXEC_PATH)
 	install -m 0644 \