Fix typos and improve formatting of README file
Fix bug when feed are unavailable
Move aperez to github
Update "plugcomputing" list name to "embedded"

Make the web site show the new name of the mailing list.
Fix missing caps letter at beginning of phrase
Describe key server service

Adds a part in the "services" section about the PGP key server,
with links to the service URLs.
Fix typos in third-person usage of verb