Merge pull request #465 from garrigue/master

open submission site
Logo for Esper
Merge pull request #468 from timeco/master

Logo for Esper

Fixes #467
Use the new SVG icons (when supported by client browser)
Put company logos in users/ and remove duplicates
Remove needless sentence about one-line comments

This sentence was already removed in English, the commit does it too
for other languages.
Small corrections

Corretto qualche errore di battitura
Merge pull request #470 from gimmy/patch-1

Small corrections
Small corrections
Merge pull request #471 from gimmy/patch-2

Small corrections
Small corrections

Other small fixes
Merge pull request #472 from gimmy/patch-3

Small corrections
add last CFP to news