ignore tags file
add pry as development dependency
No need for an exhaustive configuration file

One should not have to explicitly define all options in the configuration files.
We only need to use them to override the defaults.
[#10] Add `server` option to configuration file

closes #10
CLI: provide a nicer error when listing indices for a unreachable host

Having a proper error message is nicer than barfing up an exception. I wonder
what would be the nicest way to handle this from a library user POV, though.
:question:
bump version up to 0.5.0