a plan of open window size (ref. Studio-42/elFinder#522)
add lock marker into locked items on tree & cwd
fix error with empty folder uploading on Google Chrome
fix problem of DnD, clipboard uploading with Google Chrome
Copy & Paste in same Folder Fix

#739
Merge branch '2.x' into 2.1
enable dblClick on fileSelector(div) in icon view
[ui,cwd] fix hover of cwd
Merge branch '2.x' into 2.1
[css.cwd] add "border:none;" into .elfinder-cwd-file
Merge branch '2.x' into 2.1
[core] add 'distance:8' into fm.draggable object

For prevent unwanted drags when (dbl)clicking.
Merge branch '2.x' into 2.1
[css] fix #755, give `content-box` to button
Merge branch '2.x' into 2.1
[cmd:info] not show link when url is NULL, for virtual holder volume
Merge branch '2.x' into 2.1
[ui:cwd] fix problem of DnD, clipboard uploading with IE10, 11
[core] use location.hash for start dirctory

If location.hash is "#elf_`file.hash`", use `file.hash` as start dirctory.
[cmd:info] add command options `{nullUrlDirLinkSelf : true}`

`nullUrlDirLinkSelf : true` that make link that opens directory in elFinder, if "file.url" is null.