improved performance
changes in "print" function
update keydown event & add shortcuts
add Ctrl+N shortcut to show/hide counter
add Ctrl+I shortcut to show/hide infobar
added shortcuts option (default is true)
add Ctrl+R shortcut to reprint
add caret.moveTo function
added arrows shortcuts to scroll
fixed getTextSize
removed actions reprint, scrollup and scrolldown from infobar
increased version to 0.3.3
Merge pull request #20 from tsapeta/0.3.x

release v0.3.3