Overwrites existing files when creating a new file with the same name as an existing file

[gmittal]

This is an issue, because not only are you overwriting a file (which may not be that big of a deal, especially if the user intended to do so), but the Xcode file adder bash script adds another file path to the .xcodeproj file. This is an issue because Xcode looks for two files that are in the same location, and as a result gets confused.

Need to add a way of preventing a user from creating a file that already exists.

[gmittal]

Fixed. Simply appended "Copy" to file names that already existed.