Retrieve gson from JCenter instead of committing it

Change-Id: I7f2a55f36c5822d15eef4e81ca143a72a37c213f

app/build.gradle

diff --git a/app/build.gradle b/app/build.gradle
index dbc1140..2b5ea54 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -25,7 +25,7 @@
     compile files('libs/gerrit-rest-java-client-0.8.8-SNAPSHOT.jar')
     compile files('libs/guava-19.0-rc2.jar')
     compile files('libs/httpclient-android-4.3.5.1.jar')
-    compile files('libs/gson-2.3.1.jar')
+    compile 'com.google.code.gson:gson:2.3.1'
     compile 'com.android.support:appcompat-v7:23.1.1'
     compile 'com.android.support:design:23.1.1'
     compile 'com.android.support:support-v4:23.1.1'

app/libs/gson-2.3.1.jar

diff --git a/app/libs/gson-2.3.1.jar b/app/libs/gson-2.3.1.jar
deleted file mode 120000
index 50ba0d8..0000000
--- a/app/libs/gson-2.3.1.jar
+++ /dev/null
@@ -1 +0,0 @@
-../../third_party/gson-2.3.1.jar
\ No newline at end of file

third_party/gson-2.3.1.jar

diff --git a/third_party/gson-2.3.1.jar b/third_party/gson-2.3.1.jar
deleted file mode 100644
index 250132c..0000000
--- a/third_party/gson-2.3.1.jar
+++ /dev/null
Binary files differ