Allow expansion of %(hostname)
Do error handling for missing includes and introduce logging so that we can later on log to a file
Log empty string instead of None for blank lines
Fix the bug where the %(hostname) expansion prevented Hostname = in the section from working
Fix bug in using IdentityFile
Support expansion of environment variables and write back to config
Support expansion of environment variables and write back to config
Merge pull request #2 from dldinternet/master

Missing includes fix