Beautify README.md
Merge pull request #2 from PLG/develop

upgrading to ØMQ-4.0.1
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Framework tested on iOS7 device!
Merge branch 'develop'
v2.2: ZMQ-v4.0.4.
updated czmq submodule