Initial version of the plugin

Implemented functionality:
- installing minion
- copying minion configuration from bluepring
- basic minion authorization
Add initial version of Salt API bindings
Add logging framework to Salt API bindings
Added a binding for `highstate'
Execute initial state on minion with a call to salt master
Installation script related refactoring
RedHat (& CentOS) compatibility

* Added OS distribution detection mechanism.
* Detected systems are:
** Ubuntu,
** RedHat,
** CentOS.