Updating the Makefile and README

Change-Id: Ie37c843db3044a93c635ad6b6f249cae87dd3d78
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

Makefile

@@ -70,16 +70,16 @@ securitycheck:
 push: securitycheck minaccept
 	@echo "Pushing the change upstream..."
 	@if test -z "$(TAG)"; then \
-		git push gerrit HEAD:refs/publish/master; \
+		git push gerrit HEAD:refs/publish/15.04_STABLE; \
 	else \
-		git push gerrit HEAD:refs/publish/master/$(TAG); \
+		git push gerrit HEAD:refs/publish/15.04_STABLE/$(TAG); \
 	fi
 
 security: minaccept
 	@echo "Pushing the SECURITY change upstream..."
 	@if test -z "$(TAG)"; then \
-		git push gerrit HEAD:refs/drafts/master; \
+		git push gerrit HEAD:refs/drafts/15.04_STABLE; \
 	else \
-		git push gerrit HEAD:refs/drafts/master/$(TAG); \
+		git push gerrit HEAD:refs/drafts/15.04_STABLE/$(TAG); \
 	fi
 	ssh $(sshargs) gerrit set-reviewers --add \"Mahara Security Managers\" -- $(sha1chain)

README

@@ -17,7 +17,7 @@ To install, please follow the instructions here:
 
 UPGRADING:
 
-Mahara 1.11 supports direct upgrades from previous Mahara versions 1.1.0 and later.
+Mahara 15.04 supports direct upgrades from previous Mahara versions 1.1.0 and later.
 To upgrade an existing Mahara installation, follow the instructions here:
 
   https://wiki.mahara.org/System_Administrator%27s_Guide/Upgrading_Mahara
@@ -28,7 +28,7 @@ The system requirements for the most recent version of Mahara are here:
 
   https://wiki.mahara.org/index.php/System_Administrator%27s_Guide/Requirements
 
-Mahara 1.11 requires:
+Mahara 15.04 requires:
 
  * Database:
  ** Postgres 8.3 or later