Add file methods
Update doc
Merge pull request #150 from DylanLacey/files

Add file methods
Merge pull request #151 from DylanLacey/docs

Update tests
textfield_named to use chained find_element
Add multi-touch actions, touch actions.
Merge pull request #149 from DylanLacey/chainz

Finish multi-touch actions, touch actions.
Update iOS tests to work with new spec gem
Fix class var warnings