Elseif clause parsing - (no else if else yet)
Parsing of else-if with else
Tests for else-if node transforms.
Change test model builder to allow nested conditionals
Conditional resolver now handles nested conditionals
Add description of elseif to the readme
Merge pull request #89 from alphagov/else_if

Else if
Parsing rules for question identifier aliases

Useage
[date: date_for_adoption, alias: date_for_adoption_or_birth]

Supports the following questions
* Date Question
* Multiple Choice
* Text Question
* Salary Question