updated .gitignore
Update ask_to_proceed() to correctly handle incorrect responses
Close settings file after reading & add constants for settings
Add remove & list functionality

Add options to list all vhosts by server name (default) and in full with --full
flag which shows complete entry for vhosts. Add remove option which deletes
entries from hosts & vhosts files. Works as expected but has a bug where vhosts
with similar server names are not differentiated from each other so some
entries are deleted when not specified.