Commands/Create: Adds support for creating workloads

The create command can now be used to create workloads for the various
types.

wa/commands/templates/uiauto/uiauto_build_script

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# CD into build dir if possible - allows building from any directory
+script_path='.'
+if `readlink -f $$0 &>/dev/null`; then
+    script_path=`readlink -f $$0 2>/dev/null`
+fi
+script_dir=`dirname $$script_path`
+cd $$script_dir
+
+# Ensure gradelw exists before starting
+if [[ ! -f gradlew ]]; then
+    echo 'gradlew file not found! Check that you are in the right directory.'
+    exit 9
+fi
+
+# Copy base class library from wlauto dist
+libs_dir=app/libs
+base_class=`python -c "import os, wa; print os.path.join(os.path.dirname(wa.__file__), 'framework', 'uiauto', 'uiauto.aar')"`
+mkdir -p $$libs_dir
+cp $$base_class $$libs_dir
+
+# Build and return appropriate exit code if failed
+# gradle build
+./gradlew clean :app:assembleDebug
+exit_code=$$?
+if [[ $$exit_code -ne 0 ]]; then
+    echo "ERROR: 'gradle build' exited with code $$exit_code"
+    exit $$exit_code
+fi
+
+# If successful move APK file to workload folder (overwrite previous)
+rm -f ../$package_name
+if [[ -f app/build/apk/$package_name.apk ]]; then
+    cp app/build/apk/$package_name.apk ../$package_name.apk
+else
+    echo 'ERROR: UiAutomator apk could not be found!'
+    exit 9
+fi