Implementing workaround for slow check_nodes task.

Forging status is now checked separately from mining info; Allowing slow /api/getMiningInfo requests to be optionally avoided. Mining info can therefore be disabled permanently through config.yml or optionally at runtime from the command line.
Refactoring code.

- Handling duplicated logic through new has_section? method.
Updating README.md
Adding support for deployment to CentOS and Fedora operating systems.
Updating README.md
Updating Changelog.md