Add missing ZeroClipbpard SWF file

Flash support for ZeroClipboard is not working in project pages since
the SWF file is missing. There was a typo in the .gitignore file that
ignored "*.sw?" files.
Make the link to a project's forum optional

Omit the link to the forum if the project's metadata does not provide
a forum url
Merge pull request #5 from wilkinsona/optional-forum-link

Make the link to a project's forum optional
Merge pull request #4 from bclozel/zclip

Fix ZeroClipboard integration in gh-pages
Merge branch 'gh-pages' of https://github.com/spring-projects/gh-pages into gh-pages
Remove links to forum.spring.io