Twitter-oss: Prepare OSS libraries for release

Problem

We want to release the next versions our of Twitter OSS libraries:
  - util -> 6.39.0
  - ostrich -> 9.23.0
  - scrooge -> 4.12.0
  - finagle -> 6.40.0
  - twitter-server -> 1.25.0
  - finatra -> 2.6.0

Solution

Prepare libraries for their next releases.

RB_ID=892743
TBR=true

CHANGES

@@ -4,6 +4,10 @@ as it is included in Scrooge's user's guide.
 
 4.x
 -----
+
+4.12.0
+------
+
 - scrooge-generator: Remove check for 22 args when generating scala 
   ServiceIface. Now that we no longer support Scala 2.10 we can always
   generate a case class for the generated scala ServiceIface. 

demos/scrooge-maven-demo/pom.xml

@@ -137,7 +137,7 @@
       <plugin>
         <groupId>com.twitter</groupId>
         <artifactId>scrooge-maven-plugin</artifactId>
-        <version>4.11.0</version>
+        <version>4.12.0</version>
         <configuration>
           <thriftNamespaceMappings>
             <thriftNamespaceMapping>

project/Build.scala

@@ -14,12 +14,12 @@ object Scrooge extends Build {
   val branch = Process("git" :: "rev-parse" :: "--abbrev-ref" :: "HEAD" :: Nil).!!.trim
   val suffix = if (branch == "master") "" else "-SNAPSHOT"
 
-  val libVersion = "4.11.0" + suffix
+  val libVersion = "4.12.0" + suffix
 
   // To build the develop branch you need to publish util, and finagle locally:
   // 'git checkout develop; sbt publishLocal' to publish SNAPSHOT versions of these projects.
-  val utilVersion = "6.38.0" + suffix
-  val finagleVersion = "6.39.0" + suffix
+  val utilVersion = "6.39.0" + suffix
+  val finagleVersion = "6.40.0" + suffix
 
   val libthriftVersion = "0.5.0-7"
 

scrooge-maven-plugin/pom.xml

@@ -5,7 +5,7 @@
   <artifactId>scrooge-maven-plugin</artifactId>
   <packaging>maven-plugin</packaging>
   <name>scrooge-maven-plugin</name>
-  <version>4.11.0</version>
+  <version>4.12.0</version>
   <prerequisites>
     <maven>3.0.4</maven>
   </prerequisites>
@@ -247,7 +247,7 @@
     <dependency>
       <groupId>com.twitter</groupId>
       <artifactId>scrooge-generator_2.10</artifactId>
-      <version>4.11.0</version>
+      <version>4.12.0</version>
     </dependency>
     <!-- Test Dependencies-->
     <dependency>