added patch support

src/main/resources/android-java/apiInvoker.mustache

@@ -184,6 +184,18 @@ public class ApiInvoker {
         }
         response = client.execute(delete);
       }
+      else if ("PATCH".equals(method)) {
+        HttpPatch patch = new HttpPatch(url);
+
+        if (body != null) {
+          patch.setHeader("Content-Type", contentType);
+          patch.setEntity(new StringEntity(serialize(body), "UTF-8"));
+        }
+        for(String key : headers.keySet()) {
+          patch.setHeader(key, headers.get(key));
+        }
+        response = client.execute(patch);
+      }
 
       int code = response.getStatusLine().getStatusCode();
       String responseString = null;

src/main/resources/android-java/httpPatch.mustache

@@ -0,0 +1,16 @@
+package {{invokerPackage}};
+
+import org.apache.http.client.methods.*;
+
+public class HttpPatch extends HttpPost {
+    public static final String METHOD_PATCH = "PATCH";
+
+    public HttpPatch(final String url) {
+        super(url);
+    }
+
+    @Override
+    public String getMethod() {
+        return METHOD_PATCH;
+    }
+}

src/main/resources/android-java/pom.mustache

@@ -5,7 +5,7 @@
   <artifactId>{{artifactId}}</artifactId>
   <packaging>jar</packaging>
   <name>{{artifactId}}</name>
-  <version>{{apiVersion}}</version>
+  <version>{{artifactVersion}}</version>
   <scm>
     <connection>scm:git:git@github.com:wordnik/swagger-mustache.git</connection>
     <developerConnection>scm:git:git@github.com:wordnik/swagger-codegen.git</developerConnection>