Haproxytool

* Introduce class also for server command as we did with dad1424
* add requirements file
* introduce classes for each command to avoid long conditional statements
* fix incorrect indentation for -D in the usage
* add a helper function to parse arguments
* update README to reflect to the fact that -D is only part of command args
* cli.py does not need to parse socket\_dir

* add an extra line between function to make pylint happy
* Implicitly import sys rather using it from docopt space
* catch the error when socket\_dir doesn't exist

* add a note about not adding new MAPs
* include examples of usage for MAPs in README
* remove print statement from map.py
* don't force python3.4 in the shebang
* add support for managing MAPs

* catch exceptions raised when we instantiate HAProxy class

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* bump release
* add support for showing ID for frontend, backends and servers
* remove booking.com mail address from AUTHORS

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* cli.py bump release
* REAME: haproxyadmin lib only returns integers and not floating numbers
* dump:py simplify CLI parsing
* changes due to the refactor of PoolMember to Server in haproxyadmin library
* changes due to the refactor of PoolMember to Server in haproxyadmin library