add Travis CI to execute `mvn clean verify` for each PR (#16)

* fix checkstyle failures

* add travis file to execute `mvn clean verify` command for each pull request

.travis.yml

@@ -0,0 +1,2 @@
+language: java
+script: mvn clean verify

azure-storage-spring-boot-starter-sample/src/main/java/com/microsoft/azure/StorageSampleApplication.java

@@ -36,11 +36,11 @@ public class StorageSampleApplication implements CommandLineRunner {
     // with key words `storage` and 'java'.
     private void createContainerIfNotExists(String containerName) throws URISyntaxException, StorageException {
         // Create the blob client.
-        CloudBlobClient blobClient = cloudStorageAccount.createCloudBlobClient();
+        final CloudBlobClient blobClient = cloudStorageAccount.createCloudBlobClient();
 
         // Get a reference to a container.
         // The container name must be lower case
-        CloudBlobContainer container = blobClient.getContainerReference(containerName);
+        final CloudBlobContainer container = blobClient.getContainerReference(containerName);
 
         // Create the container if it does not exist.
         container.createIfNotExists();