Update composer.json

Changing minimum stability to Release Candidate (RC)
Update composer.json

Enable autoload for whole project.
Fixing unit tests
Fixed web package components, adapting service and model for dependency
injection, fix validation message dependencies.
Defining I18n builder interface and dispatcher, fix finder hierarchy
Fix configuration object constants, moved Messages packages to Core, so
it could serve application-wide
Created Application configure object, fixed database dependencies, added
query parameter deal update specific code.
Fixed Html package classes names and refactor on old names
Merge branch '4.0.x' of https://github.com/waspframework/waspframework.git into 4.0.x
Merge pull request #2 from waspframework/4.0.x

Update master with latests major bug-fixes