[Swift3] Fix bug where int enums generated non-compiling code. Swift3 integration tests now pass.

Author: GriffinSchneider

modules/swagger-codegen/src/main/resources/swift3/_param.mustache

@@ -1 +1 @@
-"{{baseName}}": {{paramName}}{{#isInteger}}{{^required}}?{{/required}}.encodeToJSON(){{/isInteger}}{{#isLong}}{{^required}}?{{/required}}.encodeToJSON(){{/isLong}}{{#isEnum}}{{^isContainer}}{{^required}}?{{/required}}.rawValue{{/isContainer}}{{/isEnum}}{{#isDate}}{{^required}}?{{/required}}.encodeToJSON(){{/isDate}}{{#isDateTime}}{{^required}}?{{/required}}.encodeToJSON(){{/isDateTime}}
+"{{baseName}}": {{paramName}}{{^isEnum}}{{#isInteger}}{{^required}}?{{/required}}.encodeToJSON(){{/isInteger}}{{#isLong}}{{^required}}?{{/required}}.encodeToJSON(){{/isLong}}{{/isEnum}}{{#isEnum}}{{^isContainer}}{{^required}}?{{/required}}.rawValue{{/isContainer}}{{/isEnum}}{{#isDate}}{{^required}}?{{/required}}.encodeToJSON(){{/isDate}}{{#isDateTime}}{{^required}}?{{/required}}.encodeToJSON(){{/isDateTime}}

samples/client/petstore/swift3/default/PetstoreClient/Classes/Swaggers/APIs/FakeAPI.swift

@@ -249,7 +249,7 @@ open class FakeAPI: APIBase {
         url?.queryItems = APIHelper.mapValuesToQueryItems(values:[
             "enum_query_string_array": enumQueryStringArray, 
             "enum_query_string": enumQueryString?.rawValue, 
-            "enum_query_integer": enumQueryInteger?.encodeToJSON()?.rawValue
+            "enum_query_integer": enumQueryInteger?.rawValue
         ])
 
         let nillableHeaders: [String: Any?] = [

samples/client/petstore/swift3/default/SwaggerClientTests/Podfile.lock

@@ -12,7 +12,7 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   Alamofire: fef59f00388f267e52d9b432aa5d93dc97190f14
-  PetstoreClient: bbde3383c51466fdda24ec28153ce2847ae5456f
+  PetstoreClient: 0f65d85b2a09becd32938348b3783a9394a07346
 
 PODFILE CHECKSUM: da9f5a7ad6086f2c7abb73cf2c35cefce04a9a30