csquotes' \enquote command key binding and completion trigger.

Added a key binding and a completion trigger for csquotes' \enquote command.

    \enquote{text}

csquotes offers a simple command to set text between quotes so you can waive more cryptic commands like 

    ``text''
    \glqq text\grqq
    \frqq text\flqq
    etc.

For more information about csquotes see: [CTAN doc](http://www.ctan.org/pkg/csquotes)