Make file operation Easy

• html5 file api http://www.html5rocks.com/en/tutorials/file/dndfiles/

• file data

{
	id: [sha1]
	name: [file name] 
	type: [file type]
	size: [file size]
	sha1: [file hash] 
	blob
}

• slice data

{
	id: [fileID]_[slice number]_[total slices]_[CRC]
	type: EasyFile
	sha1
	blob
}

• setID

• getID

• reset

• getProgress

• done

• setCallback

• addSlice

• split

• getSliceID

• getSlice

• countSlice

• toJSON

• toBase64

• toBlob