Add complex find
Merge pull request #139 from DylanLacey/complex_find

Add complex find
Update driver with cap changes
Validate object type
Update capabilities and appium.txt
More work on updating caps
Define load_appium_txt on Appium module.

Replace attr_reader with driver_attributes.
Rename @capabilities to caps
Fix caps
Update comments
All iOS tests passing again
Fix forwardable warnings

Fix #141