Merge pull request #4 from ithielnor/master

Added radio and boolean html value support.
Refactoring and more fixes related to radio buttons. Sample supplemented.
Equality operators (==) changed to identity ones (===) according to Douglas Crockford's book advice.
JS unit tests for boolean parsing added.
Types consistency demand.
Types consistency assertion fix for nullable types.
Minor test case modification to use nullable types.
In addition to existing, default, EQ (==) operator, new relational operators added: NE (!=), GT (>), GE (>=), LT (<), LE (<=). Implemented at server side for now.
Documentation updated, describing latest changes for server side version (related to relational attributes).
Relational operators implementation for client side. Version up to 1.2.
README minor fixes.
README fixes - push #2
Added support for enum values in expressions
Merge pull request #5 from programcsharp/master

Added support for enum values in expressions.
Improved checking for numbers and undefined values at client side. Sample extended for enum types support. Tests supplemented.
Minor documentation-related changes.
Typo in sample.
README example modified.
Formatting...
Types consistency assertions improved - corrected handling when target values are provided through backend fields.