Merge pull request #805 from nao-pon/volume_icon

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Merge pull request #806 from nao-pon/plan_open_window

a plan of open window size (ref. Studio-42/elFinder#522)
fix hover, action & CSS

* delegate() 'hover' to 'mouseenter mouseleave'
* add toggleClass('ui-state-hover') into cwd items
* correction CSS
fix hover, action & CSS

* delegate() 'hover' to 'mouseenter mouseleave'
* add toggleClass('ui-state-hover') into cwd items
* correction CSS