Merge pull request #142 from balshetzer/gh-pages

Download page for Plover
Merge pull request #143 from balshetzer/gh-pages

Make linux instructions dynamic as well
Merge pull request #144 from balshetzer/gh-pages

Remove link to documentation. It is out of date and confusing. Add downl...
Merge pull request #145 from balshetzer/gh-pages

Fix link to .tar.gz source