Update android tests
All tests passing on master branch of appium
Merge pull request #133 from DylanLacey/master

Log warning when methods are added to Selenium
Add uiautomat[ion|or] locators
Merge pull request #136 from DylanLacey/uiauto_finders

Add uiautomat[ion|or] locators
Add accessiblity_id finder
Merge pull request #137 from DylanLacey/accessibility_id

Add accessiblity_id finder
Add context switching

`current_context` returns the current context
`current_context=` sets the current context
`available_contexts` returns an array of available contexts
`within_context` takes a context and a block, and switches to the
context for the duration of the block
`switch_to_default_context` switches to the default context

Updated docs to reflect new methods;  Had to cludge some of them to use
@!method because Yard doesn't like class_eval
Merge pull request #135 from DylanLacey/contexts

Add context handling & warnings