Support building of XCode workspaces

[teobugslayer]

Allow the users to build Xcode workspaces instead of the project.

[Fatme]

Follow this steps in order to test this:

• Execute pod command. If the command is not found, execute sudo gem install cocoapods.
• Create new project and add ios platform.
• Create Podfile in platforms/ios folder
• cd platforms/ios
• Execute pod install - this will produce .xcworkspace file
• build the project