update gitignore, rename run_external_command
fix pep8 errors
don't blind import, but import all classes separately
fix pep8 errors
naar huis
add host_downtime
Added functionality and splitted the README in 3 parts.

* add host_ok
* add host_downtime functionality
* move nagios-api-cli docs to CLI.md
* move api functionality docs to API.md
* cleaned up README.md