Check out repo in a temp location just from URL

[czechboy0]

This is to make setting up Builda even easier. Instead of having to have user's project to be tested checked out locally (so that Builda can parse the Xcode project and other files), make it check out the project in a temp location just from the URL and credentials.

Possible issue: how to force Xcode to create the .xccheckout file if it's not there?

Look into xcscmblueprint, #89.
Is there a way to force xcode to create the xcscmblueprint or xccheckout files?

• Configure the script to checkout the repo in a temp location from the blueprint
• Add this to the onboarding step when choosing projects (offer to pull from GitHub directly)

[czechboy0]

Xcode 7 Beta 6 made this possible. xcrun xcsbridge source-control blueprint-checkout --path BLUEPRINT_PATH --output OUTPUT_PATH now actually checks out the repo. Super for the new onboarding where the user doesn't need to have the project checked-out locally (we will check it out in a temp location and pull info from there).