remove `dom.listBetween` and update version.
rename sz to len.
Remove empty anchors on enter key press.
Merge pull request #574 from HackerWins/bugfix/remove-empty-anchors-on-enter

Remove empty anchors on enter key press.
Fix bug: new line does not have previous line formatting on firefox
 - select with range normalize
 - Fixed #573
Update comments and remove unused function(dom.isBodyText).
Update dist files.
Merge pull request #575 from HackerWins/fixbug/firefox-newline-formatting

Fix bug: new line does not have previous line formatting on firefox
blockquote is also bodycontainer.
range.deleteContents: remove empty parents.
codeview: add newline on block element.
 - #561
Update dist files.
Merge pull request #578 from HackerWins/develop

Fix InsertParagraph bugs and add newline after block on codeview.