Add user permission api changes

Author: mpv1989

src/main/java/com/arangodb/ArangoDatabaseAsync.java

@@ -229,14 +229,12 @@ public CompletableFuture<Void> grantAccess(final String user, final Permissions
 	 * Grants access to the database dbname for user user. You need permission to the _system database in order to
 	 * execute this call.
 	 * 
-	 * @deprecated use {@link #grantAccess(String, Permissions)} instead
 	 * @see <a href= "https://docs.arangodb.com/current/HTTP/UserManagement/index.html#grant-or-revoke-database-access">
 	 *      API Documentation</a>
 	 * @param user
 	 *            The name of the user
 	 * @return void
 	 */
-	@Deprecated
 	public CompletableFuture<Void> grantAccess(final String user) {
 		return executor.execute(grantAccessRequest(user, Permissions.RW), Void.class);
 	}
@@ -245,14 +243,12 @@ public CompletableFuture<Void> grantAccess(final String user) {
 	 * Revokes access to the database dbname for user user. You need permission to the _system database in order to
 	 * execute this call.
 	 * 
-	 * @deprecated use {@link #grantAccess(String, Permissions)} instead
 	 * @see <a href= "https://docs.arangodb.com/current/HTTP/UserManagement/index.html#grant-or-revoke-database-access">
 	 *      API Documentation</a>
 	 * @param user
 	 *            The name of the user
 	 * @return void
 	 */
-	@Deprecated
 	public CompletableFuture<Void> revokeAccess(final String user) {
 		return executor.execute(grantAccessRequest(user, Permissions.NONE), Void.class);
 	}

src/test/java/com/arangodb/ArangoDatabaseTest.java

@@ -324,6 +324,16 @@ public void getCollectionsExcludeSystem() throws InterruptedException, Execution
 		}
 	}
 
+	@Test
+	public void grantAccess() throws InterruptedException, ExecutionException {
+		try {
+			arangoDB.createUser("user1", "1234", null).get();
+			db.grantAccess("user1").get();
+		} finally {
+			arangoDB.deleteUser("user1").get();
+		}
+	}
+
 	@Test
 	public void grantAccessRW() throws InterruptedException, ExecutionException {
 		try {
@@ -363,15 +373,15 @@ public void grantAccessUserNotFound() throws InterruptedException, ExecutionExce
 	public void revokeAccess() throws InterruptedException, ExecutionException {
 		try {
 			arangoDB.createUser("user1", "1234", null).get();
-			db.grantAccess("user1", Permissions.NONE).get();
+			db.revokeAccess("user1").get();
 		} finally {
 			arangoDB.deleteUser("user1").get();
 		}
 	}
 
 	@Test(expected = ExecutionException.class)
 	public void revokeAccessUserNotFound() throws InterruptedException, ExecutionException {
-		db.grantAccess("user1", Permissions.NONE).get();
+		db.revokeAccess("user1").get();
 	}
 
 	@Test