Additional info for Required validation and .gitattributes added.
Added SimpleBusinessLogic validations.

Added MaxLength, MinLength, MaxValue, MinValue, Range, IntegerRange,
DateRange and RegExMatch concepts that enables simplified validations.
Additionally DslSyntaxException has been enriched with definition of
root concept on which SyntaxException has occurred.
Merge pull request #3 from davorpr1/master

Simple validations, minor features and .gitattributes.