fix 413 issue

fix log4j issue

big move and rework on web analytix side

Merge branch 'release/v1.2.0'

Merge branch 'release/v1.2.0'

fix of a bug running spark engine on mesos. hotfix v1.1.2

ck build fix

fix some tutos config

Revert "Improve equals() and hashCode() methods Fields."

This reverts commit 65f4eb7.

Merge pull request #413 from Hurence/feature/sessionization2

Feature/sessionization2