Remove support for building with Maven

Dagger is now fully built using Bazel. The `mvn` binary is still required on travis in order to publish snapshots, and required by the release process, but not during typical development.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=150209632

.travis.yml

@@ -36,12 +36,7 @@ before_install:
   - export PATH=$M2_HOME/bin:$PATH
   - mvn --version
 
-install:
-  - mvn -B -P!standard-with-extra-repos -U install clean --fail-never --quiet -DskipTests=true -Dinvoker.skip=true
-
-script:
-  - bazel test --test_output errors //...
-  - mvn -B -P!standard-with-extra-repos -U verify --fail-at-end -Dsource.skip=true -Dmaven.javadoc.skip=true
+script: bazel test --test_output errors //...
 
 env:
   global:
@@ -61,4 +56,4 @@ branches:
 
 cache:
   directories:
-    - $HOME/.m2
+    - $HOME/.cache/bazel

compiler/src/it/functional-tests/src/main/java/test/ReleasableReferencesComponents.java

@@ -19,6 +19,7 @@
 import static java.lang.annotation.RetentionPolicy.RUNTIME;
 import static test.ReleasableReferencesComponents.Thing.thing;
 
+import com.google.auto.value.AutoValue;
 import dagger.Component;
 import dagger.Module;
 import dagger.Provides;
@@ -82,10 +83,7 @@ interface Parent extends ThingComponent {
     Child child();
   }
 
-  // TODO(ronshapiro): investigate the maven-compiler-plugin bug that is blocking javac from
-  // recognizing @AutoValue when it is imported instead of fully-qualified
-  // http://bugs.java.com/view_bug.do?bug_id=7101822
-  @com.google.auto.value.AutoValue
+  @AutoValue
   abstract static class Thing {
     abstract int count();