Remove h2 downgrade

- Use h2 from framework as #817 doesn't cause issues anymore.

build.gradle

@@ -14,7 +14,6 @@ buildscript {
 		eclipseUml2UmlVersion = '5.0.0-v20140602-0749'
 		curatorVersion = '2.11.1'
 		docResourcesVersion = '0.1.1.RELEASE'
-		h2DatabaseVersion = '1.4.199'
 	}
 	repositories {
 		gradlePluginPortal()
@@ -89,8 +88,6 @@ configure(allprojects) {
 			mavenBom "org.springframework.boot:spring-boot-dependencies:$springBootVersion"
 		}
 		dependencies {
-			// https://github.com/spring-projects/spring-statemachine/issues/817
-			dependency "com.h2database:h2:$h2DatabaseVersion"
 			dependency "log4j:log4j:$log4jVersion"
 			dependency "org.eclipse.persistence:javax.persistence:$eclipsePersistenceVersion"
 			dependency "com.esotericsoftware:kryo-shaded:$kryoVersion"