Merge branch 'release/2.4.0' into develop
prefer stable versions in dev environment
made event_subscriber priority optional
updated sugges block
provide `behat.extension.classes` variable to extensions container

to check for registered extensions
removed 5.3.2 from check
cleaned/refactored application and configuration loader
cleaned/refactored console processors
optimized basepath reading
cleaned/refactored application and core extension classes
cleaned temp container creation
updated transformers to support falsy transformations (fixes #138)
Fixed PSR2 style guide issues (thanks @fabpot and CS fixer)
cleanup autoloading routine
added clarity to "context class not found" exception
Fixed errors in Czech translation
Merge pull request #150 from zapletalitstudio/patch-1

Fixed errors in Czech translation
fix inverted args when instantiating custom formatter
Merge pull request #152 from instaclick/formatter-patch

Formatter patch
force custom class if defined