0.5.0-beta3

Database and ORM package improvements and fixes, new Darya\Foundation package for application setup, separate package readmes and HTTP response improvements.

Changelog:

General

• Added readmes for all packages, apart from Foundation
• Simplified the framework readme
• PSR-2 code style for all packages
• PSR-4 namespacing for all unit tests

Database

• Implemented a database-specific query object that provides table joins,
  subqueries, GROUP BY and HAVING, which database query translators now
  support
• Fixed MySQL connection query issues that occurred without the mysqlnd
  extension
• Added missing error check after preparing MySQL query statement result -
  Catches syntax or logical errors with queries, e.g. 'Subquery returns more
  than 1 row' for column subqueries

Foundation

• Implemented a new Foundation namespace to house classes that aid the set up
  of an application, including a configuration interface with implementations
  and a handful of default service providers
• Moved the autoloader to this namespace

HTTP

• Improved HTTP response
  • Changed response to prepare content as a string when sent instead of when
    the content is set
  • Changed content type to application/json instead of text/json for array
    content
  • Implemented Response::body() for retrieving content as a string
  • Removed old cookie methods
  • Refactored and added more dynamic properties such as status, headers,
    cookies, content and redirected
  • Unit tested

ORM

• Lots of general improvements and refactoring for Model and Record
• Implemented querying parameters (filter, order, limit) to relations and eager
  loading in Record
• Model::data() now returns transformed (non-raw attributes)
  • Raw attribute access has moved to Model::rawData()
  • The toArray(), toJson() and getIterator() methods now utilise the
    transformed attributes
• Implemented Model::convertToJson() - allows converting plain array of models
  to JSON
• Added unique() method to Query objects and Query\Builder executor methods