Enumeration (rxmicro-validation 0.1 API)

```
@Documented
@Retention(SOURCE)
@Target({FIELD,METHOD,PARAMETER})
@ConstraintRule(supportedTypes={java.lang.String.class,java.lang.Character.class},
                validatorClass={EnumerationStringConstraintValidator.class,EnumerationCharacterConstraintValidator.class})
@SelfDocumented
public @interface Enumeration
```
The annotated element must be an element of the predefined enumeration.
This validation rule is useful when java enum type is not applicable. For example if enum value equals to java keyword. The following enum couldn't be compiled, because 'new' is java keyword
enum OrderType { new, // compile error old }
To solve this issue use @Enumeration annotation, otherwise use Java enum.

Author:

nedis

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  String[] value
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  boolean off
  Allows to disable validation rule if validation inherited from super class.

- Element Detail
  - value
```
String[] value
```
    Returns:
    
    enum string values
- - off
```
boolean off
```
    Allows to disable validation rule if validation inherited from super class. By default, disable is off
    
    Returns:
    
    true if the validation must be disabled, false otherwise
    
    Default:
    
    false