Adding classpath to task

Conflicts:
	javassist-plugin/build.gradle
	javassist-plugin/src/main/java/com/darylteo/gradle/javassist/tasks/TransformationAction.java
	javassist-plugin/src/main/java/com/darylteo/gradle/javassist/tasks/TransformationTask.java
	javassist-plugin/src/main/java/com/darylteo/gradle/javassist/transformers/GroovyClassTransformation.java