used c3p0 settings against memory leaks on redeploy
changed node's c3p0 datasource to use the settings according to
<property name="jdbcUrl" value="${db.sql.jdbcUrl}"/>
<property name="user" value="${db.sql.user}" />
<property name="password" value="${db.sql.password}" />
+ <!--
+ added these properties to avoid classloader problems, see
+ http://www.mchange.com/projects/c3p0/#configuring_to_avoid_memory_leaks_on_redeploy
+ -->
+ <property name="contextClassLoaderSource" value="library" />
+ <property name="privilegeSpawnedThreads" value="true" />
</bean>
