weppy 0.7 (codename Girtab)

Changes since v0.6:

• Changed CLI 'shell' command to loads the entire application context
• Added scope option to has_one and has_many relations
• Added where option to has_one and has_many relations
• @computation and callbacks helpers now keep definition order
• Allow usage of has_one and has_many helpers as decorators to customize
  relations' sets generation
• Added default configuration for extensions
• Added Model.new method
• Added databse indexing support
• Added default validation for 'password' fields
• Added CLI 'routes' command
• Deprecated @computation, @virtualfield and @fieldmethod in favor of
  @compute, @rowattr and @rowmethod
• Updated current_model_only parameter of @virtualfield and @fieldmethod
  to bind_to_model in @rowattr and @rowmethod