Refactor prepareProject
Basic help.txt
Some improvements and fixes
* Rename bin/nativescript.cmd to tns.cmd
* Fix tns --version command
* Add appid option
* Use com.telerik.<App name> as default application identifier
* Add help for --copy-from option
* Remove setLoggerConfiguration
* Add config.client
* Fix the check for "source app/ is not a direct ancestor of a target app/"
* We don't need ensureProject, we can throw the error when projectData is initializing. ;)
* Fix message outputed from platform command
* isPlatformInstalled validation for prepare and build commands