Calabash no longer supports UIA_STRATEGY
Merge pull request #489 from calabash/feature/remove-UIA_STRATEGY-from-docs

Calabash no longer supports UIA_STRATEGY
Fix unused variable uia_strategy
Relax json dependency to ~> 1.8
Merge pull request #490 from calabash/feature/relax-json-requirement

Relax json dependency to ~> 1.8
Calabash-ios sim commands use SimControl