Add a snapshot repository to guice's parent pom configuration, so it can rely on snapshot versions of things while in development.

This should change nothing about release-time as snapshot dependencies are not kosher for release.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=86827570
diff --git a/pom.xml b/pom.xml
index b5c94af..70d9fa4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -467,4 +467,15 @@
     </profile>
   </profiles>
 
+  <!-- TODO(cgruber): Update the google parent pom or migrate to sonatype's -->
+  <!-- TODO(cgruber): Comment out dagger-adapter from extensions/pom.xml if v2 is not released. -->
+  <repositories>
+    <repository>
+      <id>sonatype-nexus-snapshots</id>
+      <name>Sonatype Nexus Snapshots</name>
+      <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+      <releases><enabled>false</enabled></releases>
+      <snapshots><enabled>true</enabled></snapshots>
+    </repository>
+  </repositories>
 </project>