SpecFlow.DSL 0.0.4

An enhancement to Specflow DSL to be able to use dynamic test data in specflow steps by bringing in variables, regular expressions and simple calculations.
**Examples**:

- Create dynamic test data and refer it in another step

When enter [[var=50]] //assign 50 to a variable named "var"

Then [[var]] equals 50 // now get variable "var" value

- Create dynamic test data using regular expression

When enter [[var=RegEx([0-9]{3})]] //assign var with 3 digit random number

Then [[var]] is a 3 digits number // now get variable "var" value

- Same applies to SpecFlow tables:
When create new user with the following details:
    |Field   | Value                                 |
    |UserName| [[name=RegEx([a-z]{5,8})]]            |        
|Password| [[pwd=RegEx([a-z]{3}[0-9]{3})]]       |
Then verify can login with username="[[name]]" and password="[[pwd]]"

- Support customerise transformation

    for example, you want to map Today to YYYY:MM:dd, add the following code in one of your Specflow steps
or put it in BeforeScenario step.
     ((IParameterTransform)
               (ScenarioContext.Current.GetBindingInstance(typeof(IParameterTransform))))
           .addTransformer(s => s.ToLower() == today ? DateTime.Now.ToString("yyyy/MM/dd") : s);

    Now in Specflow feature files, you can write:
When entered "[[timeVar=Today]]"  //timeVar will be assigned to yyyy/MM/dd, e.g 2017/12/04

- Calculations are currently NOT supported but can be supported by customerisation