Merge branch 'release/2.6.1.0' into develop
Bump version 2.6.2.0dev
Migration to tryton 2.8 #2354

* This patch includes migration to tryton 2.8

Issue ID: 390001
Task ID: en_US/project-7/task-2354
Merge pull request #22 from simmianand/feature/task-2354

Migration to tryton 2.8 #2354
Public activity stream #2439

This patch has added method that returns activity stream for public
user.

Review ID: 491001
Merge pull request #23 from priyankarani/develop

Public activity stream #2439
Bump version to 2.8.1.0
Merge branch 'release/2.8.1.0'