update tomcat plugin to 7.0.50

Author: graemerocher

gradle/assemble.gradle

@@ -104,7 +104,7 @@ task pluginsFromRepo {
         jquery: "1.10.2.2",
         resources: "1.2.1",
         scaffolding: "2.0.1",
-        tomcat: "7.0.47",
+        tomcat: "7.0.50",
         webxml: "1.4.1"
     ]
 

grails-resources/src/grails/grails-app/conf/BuildConfig.groovy

@@ -54,7 +54,7 @@ grails.project.dependency.resolution = {
 
     plugins {
         // plugins for the build system only
-        build ":tomcat:7.0.47"
+        build ":tomcat:7.0.50"
 
         // plugins for the compile step
         compile ":scaffolding:2.0.1"