Finished edits to Chapter 4.
Added explanation of frames
Rewrote most of Chapter 3
Introduced CZMQ section better
Fixed list of topics at chapter start
Edited Chapter 4
Working on Ch8 logger
Fixed some errors in Chapter 4
Fixed diagrams in Chapter 8
More fixes the Chapter 8
A couple basic questions.
Removed abuse of 'load-balance'
Removed excessive adjectives
Finished Chapter 6, more on Chapter 8
Defined SASL properly
Some comments on late chapters, scattered through. Not finished
reading them.
Merge github.com:imatix/zguide
A few comments on later chapters; not finished reading them.
added time.sleep between subscription and REQ/REP sync
it is mentioned in the manual and is in the C example
Merge pull request #268 from AvdN/master

python example syncsub missing sleep()