Add dependency graphviz-java-api from Github

Author: Mark Robinson

pom.xml

@@ -24,6 +24,13 @@
 		<java.version>1.8</java.version>
 	</properties>
 
+    <repositories>
+        <repository>
+            <id>jitpack.io</id>
+            <url>https://jitpack.io</url>
+        </repository>
+    </repositories>
+
 	<dependencies>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
@@ -57,6 +64,11 @@
 			<artifactId>snakeyaml</artifactId>
 			<version>1.7</version>
 		</dependency>
+        <dependency>
+            <groupId>com.github.jabbalaci</groupId>
+            <artifactId>graphviz-java-api</artifactId>
+            <version>f9bf94896776de6e98b5004e819b63fb4c15b15d</version>
+        </dependency>
         <dependency>
             <groupId>org.apache.taverna.language</groupId>
             <artifactId>taverna-robundle</artifactId>