Merge pull request #50 from erikalgell/master

Add set method for sockopt ZMQ_XPUB_VERBOSE
change jeromq package namespace and cleanup guide
user friendly error at bind failure
implement Closeable on ZContext
Merge pull request #52 from miniway/master

change jeromq package namespace and cleanup guide
ZContext.close doesn't have to throw an exception
Merge pull request #53 from crocket/closeable

Great!
Suppress platform dependent encoding warning

http://maven.apache.org/general.html#encoding-warning
Set the compiler version to 1.6
Merge pull request #54 from crocket/compilerVersion

Set the compiler version to 1.6
Merge pull request #55 from crocket/encoding

Suppress platform dependent encoding warning
fix a bug which unsubscribe doesn't work correctly
chapter 4 java guide
Merge pull request #56 from miniway/master

fix a bug which unsubscribe doesn't work correctly
new timer during handling timer_event doesn't set correctly

timer_event can add a new timer during iteration
the new timer must be handled correctly
Merge pull request #57 from miniway/master

ew timer during handling timer_event doesn't set correctly
ZMsg.recv documentation of flag options
Merge pull request #63 from xekoukou/master

small documentation change
Add chapter 5 guide
fix missing frame at monitoring

But monitoring will be totally rewritten