[Android] Create build directory in temp dir

 The build directory will be created in the system temp directory.
 Added two options:
  --project-dir=<DIR> Allow saving the build directory to a location
  --project-only      Skip creation of APKs.  Just save the project dir
 Modified make_apk_test.py to include option "--project_dir=." in tests

 Bug=XWALK-2394
Merge pull request #2427 from bspencer/build-in-temp-dir

Create project build directory in temp directory