All Symfony requirements set to 2.6

* Avoiding some security issues
remove unused getExtensionName in favor of getAlias
Added final to all static-access classes
Issue #371

* Added enabled parameters in some extensions
Merge pull request #377 from xphere-forks/fix/extension

[Core] Remove `getExtensionName`
Merge pull request #379 from elcodi/hotfix/final-classes

Added final to all static-access classes
Merge pull request #381 from elcodi/hotfix/added-enabled-parameters-extensions

Issue #371
Merge pull request #376 from elcodi/feature/symfony-2-6-requirements

All Symfony requirements set to 2.6
State Transitional Machine for Elcodi.

This is an implementation of a State Transitional Machine and the intergration
with given Elcodi implementation.
Merge pull request #375 from elcodi/feature/state-transition-machine

Feature/state transition machine
Fixed state transition machine composers
Merge pull request #385 from elcodi/hotfix/state-machine-composer-definitions

Fixed state transition machine composers
fix travis environment for tests
Merge pull request #387 from xphere-forks/fix/migrate-symfony-2.6

Fix travis environment for tests
Translation Component and Bundle

* This is a first implementation of how a translator should be in order not
to couple with the most important part of the application: the model
Some delta for this development

* Fixed some issues
* Implemented CachedTranslationProvider decorator
Some deltas for this development

* Renamed the component and the bundle
* Developed the platform to provide this feature in the website
Some deltas and small documentation