Fix sample-create script

Remove some unneeded lines from create template's
Application/build.gradle directory. (The keywords changed with Android
Studio 1.0, but the file gets replaced by the base template after the
initial refresh task runs.)

Also upgraded the gradle wrapper used for the initial refresh.

Bug: 20055774
Change-Id: I12c4f530efa739ac71d9031bb8f53bc413c9a586
2 files changed