Fix the issue that can't insert checkbox while calling new_heading

For the <S-CR> and <C-S-CR> keystrokes
Merge branch 'master' of https://github.com/jceb/vim-orgmode
Fix the issue that inserting a new_heading in insert mode
Merge pull request #171 from powentan/master

Pull request for issue #167
fix jumping to the first character within the body of a heading
Merge branch 'master' of https://github.com/jceb/vim-orgmode