add fontSize property into sizes object
add caret.refresh function
Ctrl+Plus shortcut increases the font-size
Ctrl+Minus shortcut decreases the font-size
changes in fonts definition in the stylesheet
define minFontSize/maxFontSize defaults
fixes in the Counter class
clear selection on cursor moving
refresh caret on data text:changed event
added comment property to the parsers
add new functions to DataLine prototype
add correct function to inverse selection if needed
Ctrl+/ shortcut to comment single line
improved tab in keydownMap
increased version to 0.5.4
Merge pull request #33 from tsapeta/0.5.x

release v0.5.4