Performance evaluation test result:

Because of laptop just have 100M network card and sata disk, so 100 million segment process by collector used 255 second, but cpu just used 28%

Jvm metric test success.

#365

fix jdbc plugin issue

support netflix fegin plugin

add svg ignore

Feature/373 service reference finish

#373

Fix issue that tomcat plugin cannot capture exception

Delete service and node reference entity, rename service and node reference sum entity to reference.

Trace dag web ui test success.

#354

Feature/365

#365

Feature/367 move data define to storage module

# Conflicts:
#	apm-collector/apm-collector-ui/src/main/java/org/skywalking/apm/collector/ui/dao/InstanceEsDAO.java

#365

2. Move all data define to storage module

#367

fix operation name that span created by spring plugin is not correct

#360

fix trace annotation not work

support trace annotation