[ADD] README

Merge pull request OCA#509 from OpenUpgrade-dev/9.0-all-in-one-2016-0…

…6-14

[ADD] all in one 2016-06-14

Merge pull request OCA#505 from savoirfairelinux/8.0_email_template

[8.0] Convert email server actions to email.template

Merge pull request OCA#500 from akretion/7.0_fix_partner_performance

7.0 fix partner performance

Merge pull request OCA#471 from NL66278/6.1-no-zsi

[FIX] Remove deprecated zsi.

Merge pull request OCA#458 from ZhenIT/6.0

[FIX] Warings about using openupgradelib

Merge pull request OCA#345 from bwrsandman/5.0_openupgradelib

Use openupgrade lib and warn old use