Add support for .xht extension which is used in some XHTML files
Add XHTML example file
Bump version to 4.0.3
Merge pull request #1757 from github/cut-release-v4.0.3

Bump version to 4.0.3
Merge pull request #1748 from mrego/xht-extension

Add support for .xht extension which is used in some XHTML files