Remove naming convensions

[pougounias]

Currently, the library imposes some naming convensions in the beans inside the Spring context XML. For instance:

<bean id="stateInitial" class="gr.ekt.fsmengine.api.DefaultState">
    <property name="stateName" value="STATE_INITIAL"/>
</bean>

A runtime error will occur, if we rename stateInitial to stateInitial1.Likewise, the same will occur if we rename STATE_INITIAL to STATE_INITIAL2.

So, we should remove these limitations.