Replace _constraint by validate method #3263

Review ID: 1093001
Add configuration wizard after nereid installation #3331

* Adds a wizard to create website

Review ID: 1443001
Improve activation and reset using itsdangerous #3420

This patch separates account activation and email verification using
itsdangerous library.

Github Issue: https://github.com/openlabs/nereid/issues/116

Review ID: 1493002
Nereid fixes after registration change #3429

Review ID: 1553001
User status returns unicode messages #3429
Simplify/Refactor tests to remove locale
Refactor URL Loading and Dispatch

* Use host aware URLs instead of building multiple maps
Retry failed transactions #3440
Fix and simplify session lookup

* Use SESSION_COOKIE_NAME for sessions
Test on postgres in addition to SQLite
Release version 3.0.2.0