Log Message:
devel/ruby-tty-screen: add version 0.7.0 package

ADd ruby-tty-screen version 0.7.0 package.

# TTY::Screen

> Terminal screen size detection which works on Linux, OS X and
  Windows/Cygwin platforms and supports MRI, JRuby and Rubinius
  interpreters.

TTY::Screen provides independent terminal screen size detection component
for TTY (https://github.com/piotrmurach/tty) toolkit.