Merge pull request #283 from penguinho/master

Fix missing AppleScript Commands
Updated screenshots for README.
Added Travis CI build status.
Updated contents of README to include all options. Used 'appium -h' for descriptions on most new options.
Added link to 'Getting started' guide.
Changed 'Getting started' link text.
Minor fixes to README.
Fixed spelling of artifacts in README.
Merge pull request #285 from edgy360/master

Update README