Improve Gradle's configuration time

By deferring dependency resolution to execution time, as intended by
Gradle.

Change-Id: I099a5f9fa8e454c9d8e3d0e63cf012e4ec133127

gradle.properties

diff --git a/gradle.properties b/gradle.properties
index 1d3591c..5502490 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -15,4 +15,6 @@
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
\ No newline at end of file
+# org.gradle.parallel=true
+
+android.enableImprovedDependenciesResolution=true