Google Reader Open entry in background tab

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Open current item in a new back ground tab with the key 'v' for Gooogle Reader.Force to open current item in a new back ground tab for Google Reader.

In current version, this function works with the key 'v'.
And open 5 starred items with the key 'Shift + v'.

Change Log:
v0.0.10: Update manifest version
v0.0.9: fix when open multiple tabs (contributed by MackieChan)
v0.0.8: Works for "google.*".
v0.0.7: Using keydown event and key code (contributed by Pongo!).
v0.0.6: Works for google.co.in.
v0.0.5: Fix a bug at email text area.
v0.0.4: open current item for Google Reader Play.
v0.0.3: Add feature that open 5 starred items with the key 'Shift + v'.