[split] Birdcage: Bump guava to 15.0 - Bump guava to 15.0 - Synchroni…

…ze bijection versions, and comment on the twitter/public bijection split

Corresponds to science review https://reviewboard.twitter.biz/r/263149/

RB_ID=263101

scrooge-maven-plugin/pom.xml

@@ -192,7 +192,7 @@
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
-      <version>14.0.1</version>
+      <version>15.0</version>
     </dependency>
     <dependency>
       <groupId>org.codehaus.plexus</groupId>