Merge pull request #46 from skybber/master

ELResolver plugin fixed. JuelEL+TomcatEL supported.
Deadlock PluginManager.initClassLoader() is invoked in parallel.
#45 Disable ReflectionHelper method cache. Performance gain is minor and it caused some error after class reload.
Bug in Watch handler path
Enhanced tests for Spring (invokation via Reflection fails after 3.2 Spring version - needs to be fixed)
Simplified ReflectionHelper invocation
Mergeable PurgeBeanELResolverCommand created, code cleanup