Fixed flake8 issues #4202

Review ID: 2953001
Merge pull request #69 from aroraumang/feature/task-4202

Fixed flake8 issues #4202
Show Task kanban view #4149

Review ID: 2923001
Merge pull request #68 from priyankarani/task-4149

Task kanban view #4149
Release version 3.0.2.0
Merge branch 'release/3.0.2.0' into develop
Update version to 3.0.3.0dev
Travis can use python-lxml apt package #3907