Remove End-of-line conversion
Fix NullReferenceException error on opening/closing Untitled

- opening: same as https://github.com/hibara/MarkDownSharpEditor/pull/16
Change the way of syntax highlighter result passing from by field to eventArgs.Result
Merge branch 'hotfix/when-webbrowser-doc-is-null' into develop
Merge branch 'hotfix/backgroundworker2-data-passing' into develop
Add Regex property to MarkdownSyntaxKeyword, and move keyword generating from form to the keyword class
Merge pull request #24 from Yasami/develop

Remove End-of-line conversion
still working for next version up...

* Improved syntax hightlighter processing performance in editor.
* Fixed various problems of loacalization.
* Fixed browser previewing bugs in new file, open a file and so on.
* Fixed bug that CSS files are registered.
etc...
ver.1.2.2.0 release.