build: Switch to use gradle wrapper

Change-Id: I13ed44edc30badebbe325e2cabd4cbd857f065ad
diff --git a/.gitignore b/.gitignore
index e6a4ae9..8c154fc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@
 # the project can be imported from settings.gradle
 .idea
 *.iml
+nb-configuration.xml
 
 # Old-style IDEA project files
 *.ipr
@@ -42,6 +43,7 @@
 # Gradle cache
 .gradle
 gradle.properties
+gradle-app.setting
 
 # Sandbox stuff
 _sandbox