Fix: #734

fix exporter append

Mod: Remove unnecessary return and judgement.
# Conflicts:
#	cluster/router/tag/tag_router.go

Fix: fix init config problem in HystrixFilter

Rft: Change file name to the same as interface name

Doc: modify changes.md

fix: When using service discovery and provider is registered, consumer can't refresh directory

Fix: Register service instance after provider config load

call subscribe function asynchronously

Fix: fix tag router rule copy

Rft : merge 1.4