Added fields filter for `Crud` and `Mapper\Link`

Fixed #436

Added Mapper\Link

Merge pull request #435 from AntonShevchuk/master

Added `Mapper\Link` class

Updated Validator

Added magic __invoke to ValidatorChain
Added test for regexp shorthand function
Updated exceptions
Fixed Redirect helper
Removed unused old method

Validator refactoring

Backward compatibility was broken

Controller mapper refactoring

Merge pull request #427 from AntonShevchuk/master

Added test for `Proxy\Router`

Performance and architecture tunning

Merge pull request #422 from AntonShevchuk/master

Controller's refactoring

Add helper functions

Added classes Collection and Line
Added functions:

• array_add($array, ...$keys)
• array_set($array, ...$keys)
• array_get($array, ...$keys)
• array_has($array, ...$keys)
• value($val)
• str_trim_end($string, $chars)
• to_camel_case($string)
  Increased test's coverage

Refactoring.

Merge pull request #407 from AntonShevchuk/master

Refactoring. Season 01

Hotfix for cache

Merge pull request #405 from AntonShevchuk/master

Fixed error with FileSystemCache

Just hotfixes

Merge pull request #403 from AntonShevchuk/master

Fixed gravatar View Helper