Added priority to the sample project DSL and test.

Changes in tests to reflect stub-priority feature added by @mariuszs.

accurest-gradle-plugin/src/test/groovy/io/codearte/accurest/plugin/BasicFunctionalSpec.groovy

@@ -43,6 +43,7 @@ class BasicFunctionalSpec extends IntegrationSpec {
 			def generatedClientJsonStub = file(GENERATED_CLIENT_JSON_STUB).text
 			new JsonSlurper().parseText(generatedClientJsonStub) == new JsonSlurper().parseText("""
 {
+    "priority: 2",
     "request": {
         "method": "PUT",
         "headers": {

accurest-gradle-plugin/src/test/resources/functionalTest/bootSimple/repository/mappings/com/ofg/twitter-places-analyzer/pairId/colleratePlacesFromTweet.groovy

@@ -1,4 +1,5 @@
 io.codearte.accurest.dsl.GroovyDsl.make {
+		priority 2
     request {
         method 'PUT'
         url '/api/12'