Advance Spine version to 0.7.24-SNAPSHOT

Author: alexander-yevsyukov

build.gradle

@@ -33,7 +33,7 @@ buildscript {
         guavaVersion = '20.0'
         protobufGradlePluginVerison = '0.8.0'
 
-        spineVersion = '0.7.23-SNAPSHOT'
+        spineVersion = '0.7.24-SNAPSHOT'
         //TODO:2016-12-12:alexander.yevsyukov: Advance the plug-in version together with all the components and change
         // the version of the dependency below to `spineVersion` defined above.
         spineProtobufPluginVersion = '0.6.6-SNAPSHOT'