rename package "coprocessor" to "observer"
fixed len metrics done
Merge branch 'inverted-index' of https://github.com/KylinOLAP/Kylin into inverted-index

Conflicts:
	cube/src/main/java/com/kylinolap/cube/invertedindex/IIKeyValueCodec.java
	cube/src/main/java/com/kylinolap/cube/invertedindex/TableRecordInfo.java