fix support dependencies

specify that appcompat-v7 and recyclerview-v7 are aar dependencies, so that the generated POM file is correct.
bump the versions of recyclerview-v7 and support-annotations to 22.0.0, to align with the version of appcompat-v7

library/build.gradle

@@ -18,9 +18,9 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:22.0.0'
-    compile 'com.android.support:support-annotations:21.0.3'
-    compile 'com.android.support:recyclerview-v7:21.0.3'
+    compile 'com.android.support:appcompat-v7:22.0.0@aar'
+    compile 'com.android.support:support-annotations:22.0.0'
+    compile 'com.android.support:recyclerview-v7:22.0.0@aar'
 }
 
 publish {