Text copied from Terminal with formatting in Mavericks
Under the Mavericks version of the Apple operating system, the Terminal session now also copies that formatting by default, when pasting you can choose to paste and match style (alt-cmd-V), but you can also disable copy/pasting the formatting from Terminal by changing the com.apple.Terminal preferences file.
Open Terminal on your Mac and enter the following command:
defaults write com.apple.Terminal CopyAttributesProfile com.apple.Terminal.no-attributes
This will strip all text attributes out of copy/pasting from Terminal