http://DannyDouglass.com/blog/2011/02/24/create-a-recursive-ruby-script-to-replace-file-and-directory-names-and-file-contents/

Post-RecursiveRubyScript-4

def replaceFileContents( path, patternToReplace, newProjectName )
    fileContents = File.read ( path )
    fileContents = fileContents.gsub( patternToReplace, newProjectName )
    File.open( path, 'w' ) { | file | file.puts fileContents }
end  
def packageInitiator( startDirectory, patternToReplace, newProjectName )   
    directoryItems = Dir.glob( startDirectory ).reverse
    directoryItems.each do | path | 

        # ignoring ruby scripts so I don't change contents of this file
        if( FileTest.file? ( path ) and File.extname( path ) != '.rb' )
                replaceFileContents( path, patternToReplace, newProjectName )
        end

        if( path.include? patternToReplace )
            oldPath = File.dirname(path)
            newPath = oldPath + '/' + File.basename( path ).gsub( patternToReplace, newProjectName )

            File.rename( path, newPath )    
        end

    end
end  
packageInitiator( './**/*', '{projectName}', 'MyNewProjectName' )