Added iPhone XR, XS and XS-Max support, simulator launch change

Thanks to @EtienneLem:

• Support iPhone XS, iPhone XS Max and iPhone XR (#236)

Update to simctl v2.x:

• Use simctl v2.x (simulator not restarted) (#237)

Chores: migrate to eslint, deps update

Chores: thanks to @brodybits:

• CI updates (patch release branch)
• package.json update url (patch release branch)
• Migrate to eslint (patch release branch)
• package.json plist@2 & sort deps (patch release)

Chores: jasmine 2 update, added more e2e tests

Thanks to @kelvindart:

• Remove unnecessary call to fixSimCtlList in showsdks (#221)
  Chores:
• Updated to use jasmine 2
• Added e2e tests for commands showsdks, showdevicetypes, start

chores: plist@3 update, ios device names fix

Chores:

• CI Fixes due to unit tests (#222)
• Updated CI scripts to clean npm cache (#228)
• package.json use plist@3 & sort dependencies

Thanks to @aharbick:

• It seems like iOS device names have changed again... (#224) …

Fixed Xcode 9 issues

Updated simctl dependency to 1.1.1 to fix launching the Simulator issue on Xcode 9 versus Xcode 8.

Remove process.exit when simctl prerequisite is not present.

The init() function will return a shell return code. In the CLI context, when the return code is non-zero, it will then call process.exit with that return code.

Since the behavior has changed, the version is bumped a major so that module dependents don't pick this up automatically and encounter unexpected results.

Updated dependency for simctl to v1.0.0

• Fix #208 - Support new simctl 1.0.0 simctl.list json format
• Updated Xcode requirement to Xcode 8 and greater

Fixed showdevicetypes error when runtime does not contain devices

Fixes #203 - Running "ios-sim showdevicetypes" throws error "Cannot read property 'replace' of undefined"

Re-fix #202

iPad Pro quirks in xcrun simctl that weren't handled.

getdevicetypes/showdevicetypes reconciliation

Fixes #202