Fix xcode version comparison
Merge pull request #48 from NativeScript/fatme/fix-xcode-version-comparison

Fix xcode version comparison
Remove simplemocha reference.
Changed tabs to spaces in Gruntfile.js
Convert Gruntfile.js spaces to tabs
Rename platform-service-tests to platform-service
test start now platform-agnostic
Fix the test call; Call unit test run on pack
Run tests on pack.
Transfer the test run from grunt to npm
Remove redundant grunt attribute
Added the base implementation of the update-platform command
Temporary commit; Working on adding a test, involving a call to a stubbed method
Fix the update-fallback-to-add test
Some short tests and an initial form of the updatePlatform method