Create a test bundle.
Implement retain-release tests for the iOS framework
I forgot how to manage memory manually.
Merge pull request #227 from MaddTheSane/tests

Add test cases via XCTest
Make firstChild, lastChild, previousSibling and nextSibling be calculated properties.
Merge pull request #231 from dgileadi/node-impl

Change Node to make firstChild, lastChild, previousSibling and nextSibling be calculated properties
Merge branch '2.x' of https://github.com/SVGKit/SVGKit into 2.x

# By C.W. Betts (3) and David Gileadi (1)
# Via adamgit (2) and David Gileadi (1)
* '2.x' of https://github.com/SVGKit/SVGKit:
  Make firstChild, lastChild, previousSibling and nextSibling be calculated properties.
  I forgot how to manage memory manually.
  Implement retain-release tests for the iOS framework
  Create a test bundle.