java 8:(Perm Gen) split into (Compressed Class Space) and Metaspace

Merge branch 'feature/collector-modelization' of https://github.com/OpenSkywalking/skywalking into feature/collector-modelization

fix occur ClassCastException when call the method of return generate key

spring mvc-annotation -3.x not work

Merge branch 'feature/collector-modelization' of https://github.com/OpenSkywalking/skywalking into feature/collector-modelization

```
17:45:48.486 [pool-2-thread-1] ERROR org.skywalking.apm.collector.core.module.instrument.MetricCollector -
##################################################################################################################
#                                             Collector Service Report                                                                                                                                            #
##################################################################################################################
BaseB:
 P-B:
BaseA:
 P-A:
  public void org.skywalking.apm.collector.core.module.ModuleABusiness1Impl.print():
   Avg=1585 (nano), Success Rate=100%
```

fix #559

Merge branches 'feature/collector-modelization' and 'feature/collector-modelization' of https://github.com/OpenSkywalking/skywalking into feature/collector-modelization

support spring3 plugin