Add info regarding tests, lint, and checkstyle (#509)

Author: SUPERCILEX

CONTRIBUTING.md

@@ -30,8 +30,10 @@ Feature parity (where it makes sense) is a strict requirement for feature develo
 ### Code reviews
 
 All submissions, including submissions by project members, require review. We
-use Github pull requests for this purpose. We adhere to the
+use GitHub pull requests for this purpose. We adhere to the
 [Google Java style guide](https://google.github.io/styleguide/javaguide.html).
+In addition, style and lint checks are run on each Travis build to ensure quality. To run the full
+suite of tests, checks, lint, etc, use `./gradlew check` (this will ensure the Travis build passes).
 
 ### The small print
 

PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,6 @@
 Hey there! So you want to contribute to FirebaseUI? Before you file this pull request, follow these steps:
 
   * Read [the contribution guidelines](CONTRIBUTING.md).
+  * Run `./gradlew check` to ensure the Travis build passes.
   * If this has been discussed in an issue, make sure to mention the issue number here.  If not, go file an issue about this to make sure this is a desirable change.
   * If this is a new feature please co-ordinate with someone on [FirebaseUI-iOS](https://github.com/firebase/firebaseui-ios) to make sure that we can implement this on both platforms and maintain feature parity.