Respect-validation

- `snake_case` support for rules (based on PEP8)

- Translation. Multi-language support

Added

- Create "Fibonacci" rule (637)
- Create "IdentityCard" rule (632)
- Create "Image" rule (621)
- Create "LanguageCode" rule (597)
- Create "Pesel" rule (616)
- Create "PhpLabel" rule (652)

Changed

- Allow the define brands for credit card validation (661)
- Define names for the child of Not rule (641)
- Ensure namespace separator on appended prefixes (666)
- Length gets length of integers (643)
- Set template for the only rule in the chain (663)
- Throw an exception when age is not an integer (667)
- Use "{less/greater} than or equal to" phrasing (604)

- Fix for KeySet

All notable changes of the Respect\Validation releases are documented in this file.

Added

- Add "alpha-3" and "numeric" formats for "CountryCode" rule (530)
- Add support for PHP 7 (426)
- Create "BoolVal" rule (583)
- Create "Bsn" rule (450)
- Create "CallableType" rule (397)
- Create "Countable" rule (566)
- Create "CurrencyCode" rule (567)
- Create "Extension" rule (360)
- Create "Factor" rule (405)
- Create "Finite" rule (397)
- Create "FloatType" rule (565)
- Create "Identical" rule (442)
- Create "Imei" rule (590)
- Create "Infinite" rule (397)
- Create "IntType" rule (451)
- Create "Iterable" rule (570)
- Create "KeyNested" rule (429)
- Create "KeySet" rule (374)
- Create "KeyValue" rule (441)
- Create "Mimetype" rule (361)
- Create "NotBlank" rule (443)
- Create "NotOptional" rule (448)
- Create "Optional" rule (423)
- Create "ResourceType" rule (397)
- Create "ScalarVal" rule (397)
- Create "Size" rule (359)
- Create "SubdivisionCode" rule for 252 countries (411)
- Create "VideoUrl" rule (410)
- Create method `getMessages()` for nested exceptions (406)

Changed

- Add country code to the message of "PostalCode" exception rule (413)
- Make "ArrayVal" validate only if the input can be used as an array (574)
- Make "Between" rule inclusive (445)
- Make "Max" rule inclusive (445)
- Make "Min" rule inclusive (445)
- New generic top-level domains (368)
- On `AbstractRelated` (`Attribute`, `Call` and `Key`) define names for child rules (365)
- On exceptions, convert `Array` to string (387)
- On exceptions, convert `Exception` to string (399)
- On exceptions, convert `Traversable` to string (399)
- On exceptions, convert resources to string (399)
- On exceptions, do not display parent message then rule has only one child (407)
- On exceptions, improve `Object` conversion to string (399)
- On exceptions, improve conversion of all values by using JSON (399)
- On exceptions, nested messages are displayed in a Markdown list (588)
- Rename exception class "AbstractGroupedException" to "GroupedValidationException" (591)
- Rename exception class "AbstractNestedException" to "NestedValidationException" (591)
- Rename rule "Arr" to "ArrayVal"
- Rename rule "Bool" to "BoolType" (426)
- Rename rule "False" to "FalseVal" (426)
- Rename rule "Float" to "FloatVal" (426)
- Rename rule "Int" to "IntVal" (426)
- Rename rule "NullValue" to "NullType"
- Rename rule "Object" to "ObjectType"
- Rename rule "String" to "StringType" (426)
- Rename rule "True" to "TrueVal" (426)
- Use `filter_var()` on "TrueVal" and "FalseVal" rules (409)

Removed

- Drop support for PHP 5.3 (466)
- Remove `addOr()` shortcut (444)
- Remove `NestedValidationExceptionInterface` interface (591)
- Remove `not()` shortcut (444)
- Remove `ValidationExceptionInterface` interface (591)
- Remove identical checking from "Equals" rule (442)
- Removed Deprecated Rules (277)
- Validation rules do not accept an empty string by default (422)