Update version to 1.4 and copyright year to 2014.
Add tentative changelog for 1.4 to the documentation.
Since Google Code no longer allows file upload, replace download links with GitHub release links.



git-svn-id: http://pugixml.googlecode.com/svn/trunk@968 99668b35-9821-0410-8761-19e4c4f06640
Add scripts for Travis CI

git-svn-id: http://pugixml.googlecode.com/svn/trunk@969 99668b35-9821-0410-8761-19e4c4f06640