sync validation and api for es6/es5 usage

[pleerock]

fixes #22 and #23

[pleerock]

@llwt I have published it under class-validator@next. There are some additional changes I would like to bring before I publish as latest. Try @next until that. If you want to contribute it would be great if you can provide test coverage for functionality you want (or any other functionality you think is important)

[sanex3339]

Right now ValidationError are exists in ValidationError[] array even if validation was success but with empty constraints

// @IsBoolean()

 ValidationError {
    target: 
     Options {
       compact: true,
       debugProtection: false,
       debugProtectionInterval: false,
       disableConsoleOutput: false,
       encodeUnicodeLiterals: true,
       reservedNames: [],
       rotateUnicodeArray: true,
       selfDefending: true,
       sourceMap: false,
       sourceMapMode: 'separate',
       unicodeArray: true,
       unicodeArrayThreshold: -1,
       wrapUnicodeArrayCalls: true },
    value: true,
    property: 'wrapUnicodeArrayCalls',
    children: [],
    constraints: {} } 

[sanex3339]

with alpha.2 still got empty errors

 ValidationError {
    value: 'separate',
    property: 'sourceMapMode',
    children: [],
    constraints: {} },

[github-actions]

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