fixing assertions to work with react 0.12.0. Adding some assertions to check for element and class
Updating react dependency to 0.12.0
Fixing to work with new react component interface. Adding ability to look up component by tag, check if valid class, check if valid element.
Fixing specs to work with new interface.
Bumping version to 0.0.6
indentation
changing to use the new text component interface
making componentsWithTag return DOM components instead of composites
Revert "Bumping version to 0.0.6"

This reverts commit 31ab30cf61b751bb1004260d986c5b54537e9088.
Merge pull request #4 from ekryski/master

Upgrade to React 0.12.0