DO NOT MERGE. Move to using prebuilts/fullsdk instead of prebuilts/sdk

Relanding this since ag/1642243 has landed.

Change-Id: I200a0b26b2e0cefbfbc7512c02f7755c516b4c38
Test: compiles both from terminal using gradlew and from android studio
diff --git a/.gitignore b/.gitignore
index 6c671f7..a59f7e1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 .project
 .settings/
 project.properties
+local.properties
 **/bin
 **/gen
 *.iml