Made changes to ch04-logic-and-recursion.asciidoc
Added simple OTP étude; removed .beam files
Add images and Etude 11-3. Changed Etude 11-2 to use ?SERVER
instead of manifest constant atom "weather".
Commit so that I can successfully pull.
Merge branch 'master' of https://atlas-server.oreilly.com/git/1234000000726

Conflicts:
	ch11-otp.asciidoc
Changed Marco and Jasper to Michele and Steve.
Added chat room etude.
Minor corrections to chapter 11