[#4348] CS fixes

- indentation
- trailing whitespace
Merge branch 'feature/4348' into develop

Close #4348
Merge pull request #4400 from noopable/patch-FormElementManager-withParams

Ability to get an element with creation options from the FormElementManager
Merge branch 'feature/4400' into develop

Close #4400
Merge pull request #4401 from tolean/feature/empty_fallback_value

add flag for fallback value
Merge branch 'feature/4401' into develop

Close #4401
Merge pull request #4449 from mtymek/feature/separate_console_route_matcher

Console route improvements
[#4449] docblock fixes

- Ensured docblock references were correct
Merge branch 'feature/4449' into develop

Close #4449
Fix name of test
Remove unknown invokables from FilterPluginManager
Add JsonSerializable polyfill for PHP versions less than 5.4.0
Add zend-json as a required dependency
Fill SharedEventManager events with identifiers
Add tests for proper Checkbox checked/unchecked value handling
Allow Checkbox to return the intended value instead of a boolean when checked/unchecked
Fix priority not handled in AggregateHydrator
PR #4500
Merge branch 'add/ddl.columnBigInt' of git://github.com/samsonasik/zf2 into samsonasik-add/ddl.columnBigInt
Merging PR #4500
Merge branch 'samsonasik-add/ddl.columnBigInt'
Forward #4500
Merge branch 'samsonasik-add/ddl.columnBigInt' into develop