Change package name and artifact groupId to com.gravity9

    * Changed package name
    * Changed groupId
    * Refeormatted code with standard formatting

Author: BartekGravity

.travis.yml

@@ -20,7 +20,7 @@
 /*
  * Project-specific settings. Unfortunately we cannot put the name in there!
  */
-group = "com.github.java-json-tools";
+group = "com.gravity9.java-json-tools";
 sourceCompatibility = JavaVersion.VERSION_1_7;
 targetCompatibility = JavaVersion.VERSION_1_7; // defaults to sourceCompatibility
 project.ext.description = "JSON Patch (RFC 6902) and JSON Merge Patch (RFC 7386) implementation in Java, using extended TMF620 JsonPath syntax";