Implementation of PhpDriver, JsonDriver, YamlDriver

[ptheberge]

This is a branch off of jdrich's recently accepted pull request. Wrote some code to allow for the use of configuration files for Drest rather than annotations in the Doctrine models.

[leedavis81]

This is awesome, thank you so much for your contribution. I'll have a play a little later an get this stuff merged in ASAP. Just an FYI there's a list in the v1.0.0 milestone of everything I want to achieve for a first full release (i've added this stuff to it). I'm hoping to have this completed fairly soon so you'll have something viable for production.

https://github.com/leedavis81/drest/milestones

Changes from BETA:

No longer allowed to inject the EntityManager directly. A Drest\EntityManagerRegistry must be used. A convenience method is allowed to quickly set up where only a single entity manager is needed.
Service actions can now hook onto the entity manager registry where ->getEntityManager() simple returns the default.
Removed optional support for php 5.6
Dropped support for php 5.3 (sorry, traits are really handy)
Added support for HHVM
Added support for php 7
A large number of tidy up changes
Pushed code coverage to 100%
Pushed scrutinizer quality score above 8.0
Removed injectRequest option, and always inject request object into a handle.
Add support for multiple drivers
Add YAML, PHP and JSON configuration drivers

[leedavis81]

Slightly worried about the duplication on processRoutes / processMethods in Mapping\Driver\Php and Mapping\Driver\PhpDriver Mapping\Driver\AnnotationDriver. The logic itself is identical, it just accesses config differently. i.e $route['Pattern'] instead of $route->Pattern.

Be nice if we could normalise this, possibly build a \Drest\Mapping\Annotation\Route (i know this is within the annotation namespace) object form every configuration and work the logic on that.

Not 100% sure on any drawbacks for this (memory consumption is one).

[leedavis81]

Also worth keeping an eye on: https://scrutinizer-ci.com/g/leedavis81/drest/inspections/26998928-f40c-4547-8f74-ff0bc1895f72/issues/?status=all

Trying to remove this issues entirely.

[ptheberge]

I've updated the code for the drivers based off of the scrutinizer results and implemented ArrayAccess on \Drest\Mapping\Annotation\Route, moving processRoutes() to AbstractDriver.php.

processMethods() looks to be different enough to warrant PhpDriver.php having it's own implementation of the function (since there's no reliance on annotations there).

Let me know what you think!

[coveralls]

Changes Unknown when pulling e305743 on ptheberge:master into ** on leedavis81:master**.