Ref: #3543

Jitsi Meet doesn't seem to work with c2s_require_encryption set to true.
c2s_require_encryption is false by default. However it is possible that
in some Prosody configurations it is overriden by a global config to be
true. In that case Jitsi Meet might not work out-of-box. So let's set it
explicitly to be sure it is correct.

This is to help understanding how things are wired.

Use Maven in place of ant
Add --host parameter for jicofo
Add build for jitsi Meet

Revert "Force jquery-ui version to fix pb with beta version we can get with npm"

This reverts commit 35a8641e62.

It makes for a bad first-time experience for users, since the desktop sharing
button will be visible, but it will never work.

Also get rid of the now deprecated `desktopSharingChromeMethod` option.

Adds the --host argument to the jicofo command, as suggested by exs on irc.

There is no YOURSECRET4 mentions in the document

Add a note about the need to forward ports, as suggested by @joudinet on github.

Adds jicofo install instructions.

* in the example code for config.js in INSTALL.md
  contains three key-value-pairs not present in the example file
  'config.js.example' - these were appended without inserting a comma
  and the last two of these were commented out without removing
  the trailing comma - the example file 'config.js.example' is correct
  but using the INSTALL.md version causes the page render to halt prematurely
  making login impossible

Don't  use the prosody admin console, as it's disabled.

If `lsb-release` is not installed, an invalid entry is added to `/etc/apt/sources.list`, leaving apt in an unusable state

Applies Fcrancois's suggestion about tipping users where they can start testing.
Removes occurrences of jitmeet since the name is no longer in use.

Change some jitmeet references to Jitsi Meet and other minor cleanup.