Remove var_dump() from extensions.feature

The var_dump() seems to be a remnant of development work, not really part of the feature itself.
Merge pull request #528 from FGM/patch-1

Remove var_dump() from extensions.feature
Added back ability to use custom classes as formatters
Snippets from non english scenarios
check if argument is string in isStringAndMatchesPattern
better readable string check
Merge pull request #539 from vaidasm/hotfix/is-string-check

check if argument is string in isStringAndMatchesPattern
Merge pull request #538 from kibao/feature/snippets-non-english-scenarios

Snippets from non english scenarios
Downgrade Gherkin dependency to stable
Bump changelog
Added a link to the Behat 3 documentation in the readme
Fixing typo in generated docblock
Merge pull request #545 from jamiehannaford/class-generator-typo-fix

Fixing typo in generated docblock
Make rerun cache path configurable & optimise cache dump

Fixes #543
Describe override of profile filters with CLI options

Describes #541
Make sure that CLI options do override profile filters

Fixes #541
Refactor TurnipPatternPolicy
Provide failing scenario for pattern starting from token

Describes #540
Fix turnip definitions starting from token

Fixes #540
Fix token-based transformation bug discovered after previous commit