Add script for running UI tests from the command line

Usage:
$ cd tools/idea
$ ant guiTests

Test results are written to build/TEST-*

Change-Id: I5e395e4348eb70ef65ae819277555ee95642bdfb
(cherry picked from commit 7c48b9da9b078f4b7e1282cf906632af9909b7db)
diff --git a/.gitignore b/.gitignore
index 6aba63e..8ccf95b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,5 @@
 .jps-build-data
 /bin/build-log.xml
 /bin/build.log
+/androidStudio
+/build/TEST*