Give gradle projects more human-friendly names

This simplifies tapas support, and should make working
with GmsCore in Android Studio easier

Change-Id: Ie40883ea1e83a2e4cd32dae3f239c6c8626be1c6
diff --git a/build.gradle b/build.gradle
index fa121f1..d0b1452 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,5 +14,5 @@
 }
 
 dependencies {
-    compile project(':external:guava')
+    compile project(':guava')
 }