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
Delete links to forum.spring.io
Merge pull request #1126 from bclozel/gh-pages

* pull1126:
  Delete links to forum.spring.io
  Make the link to a project's forum optional
  Add missing ZeroClipbpard SWF file
Change Forum navbar item to Questions

The projects navbar should mirror the one on the spring.io website.
Update links to CLI installation docs
Add start.spring.io link in quick start
Merge pull request #7 from bclozel/forum

Update navbar item "Forum" -> "Questions"
Fix company name and website in footer
Merge remote-tracking branch 'gh-pages-upstream/gh-pages' into gh-pages