Release 0.2.2 version

This release adds support for changing the address and the port of servers and it also comes with some python2 compatibility fixes for exceptions.

Changelog:

• Revert "Add 'slim' metric for servers"
• DOC: One more try to get this right
• DOC: Update docstring for address method
• Add support for changing address and port of a server
• DOC: Fix various documentation issues
• Add 'slim' metric for servers
• Don't check if ACL/MAP is a file
• Return empty list if a acl doesn't have any entries
• DOC: Change python version we use for development
• Ignore Python 3 class hierarchy of OSError errors
• Return empty list if a map doesn't have any entries
• Fix example code for show_map function
• Fix incorrect module path for constants in docstring
• Add support for slim metric to Server object
• List server metric names in alphabetic order
• Added setaddress and address to Servers
• Fix docstrings
• Remove unused variables
• Ignore Python 3 class hierarchy of OSError errors
• Update installation instructions