Merge pull request #14 from dreispt/8.0-merge-contract

Merge 'OCA/contract/8.0' into 'OCA/project-service/8.0'
Fix view errors introduced by upstream changes
Move project_sla out of unported dir and make installable
Port to 8.0
Add i18n
Add SLA Control to Tasks
Module icon now should be in static/description
Split project_sla into three smaller modules