Add more config parameters for android_build�

Add more parameters to the android_build command. This allows us to be more explicit with our build variants and it terms will save minutes on circleCI by only specifying the build variantes that we really needs

fixes react-native-community#33

src/commands/android_build.yml

@@ -1,12 +1,24 @@
-description: Builds the Android app at the given path with the given build types. This should be run only after installing dependencies. 
+description: Builds the Android app at the given path with the given build types. This should be run only after installing dependencies.
 
 parameters:
   project_path:
     description: The path to the root of the Android project you want to build, relative to the root of the repository.
     type: string
     default: "./android"
-  build_type:
-    description: The build type to build. This is normally either "debug" or "release" but you may have custom build types configured for your app.
+  max_workers:
+    description: The number of workers to use for a build
+    type: integer
+    default: 2
+  assemble_build_type:
+    description: The build variant to build. This is normally either "assembleDebug" or "assembleRelease" but you may have custom build variants that you can specify here.
+    type: string
+    default: "assembleDebug"
+  assemble_test_type:
+    description: The test build varinat to build. This is normally "assembleAndroidTest" but you may have custom build variantes that you can specify here.
+    type: string
+    default: "assembleAndroidTest"
+  test_build_type:
+    description: The test build type to build. This is normally "debug" or "release".
     type: string
     default: "debug"
 
@@ -59,7 +71,7 @@ steps:
 
   - run:
       name: Build Android APK
-      command: "cd <<parameters.project_path>> && chmod +x gradlew && ./gradlew --build-cache --max-workers 2 --continue assemble<<parameters.build_type>> assembleAndroidTest -DtestBuildType=<<parameters.build_type>> --stacktrace"
+      command: "cd <<parameters.project_path>> && chmod +x gradlew && ./gradlew --build-cache --max-workers <<parameters.max_workers>> --continue <<parameters.assemble_build_type>> <<parameters.assemble_test_type>> -DtestBuildType=<<parameters.test_build_type>> --stacktrace"
 
   - run:
       name: Collecting Gradle Build caches for saving