Added to readme info about express-request-parameters

Error message can be either string or function returning string

Error messages section

Error messages section

0.1.7

Fixed nested objects and array validation, fixed docs

0.1.6

Fixed node version in package.json

0.1.5

Use function constructor for ValidationError, because there is no Reflect from babel-plugin-transform-builtin-extend in node 4

0.1.3

Updated docs, declare node 4 support

0.1.2

Include /examples

Include runkitExample.js