weppy 0.8 (codename Hadar)

Changes since 0.7:

• Several bugfixes
• Added readable fields handling in forms
• Enhanced HTTP errors on streaming
• Improved templater performance
• Added dbset option to in validator
• Ensuring unique validation is performed also without forms
• Better implementation for nested selection when using join and including
• Updated router to allow routes override
• Changed default serialization and validation of datetime fields to respect
  RFC3339 standard
• Updated postgres default adapters to latest available from pyDAL
• Changed has_one attributes when using join and including
  to not be lists
• Added support for 'bigint' fields in the migrator