Netmiko 0.3.0

• Add support for SSH keys, SSH proxy, and SSH config file
• Use Flake8 for code valdiation
• Add global_delay_factor argument
• Gracefully exit SSH for Cisco IOS and cisco-like devices
• Ignore non-UTF8 characters
• Improve handling of CLI line wrapping (backspace characters in output)
• Add Juniper-handler to automatically enter cli
• Updating SCP handler to allow non 'flash:' file system
• New vendor support:
  Alcatel SROS
  Extreme
  Enterasys
  Dell-Force10 (DNOS9)
  Generic Linux handler