Tidy up;

  * renamed `bash_colors.php` to `term_colors.php`
  * TTY constant moved to phake::is_tty()
  * `color()` renamed to `colorize()`
  * colors array is static var inside `colorize()`
  * moved `write()` and `writeln()` to `global_helpers.php`
  * simplified write()/writeln(), removed `output()` - unsure of its purpose
  * `write()` no longer inserts a space after a newline