Abort dependency of spark-bigdl.conf and add java serializer to spark-analytics-zoo.conf (#575)
Abort dependency of spark-bigdl.conf and add java serializer to spark-analytics-zoo.conf (#575)

* add conf

* update pom

* fix python

* change to init spark conf

* update

* fix

* try

* update

* trial

* change to target in pythonpath

* revert

* update ut

* style

* style

* update

* update apps

* minor update

* refactor scala

* remove getsparkcontext

yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL