initial approach for #91 collecting monitor info

should lay down the basics for implementation
shape a bit more displays report module
removed extra echos from postflight and install

to keep all scripts consistent
further building displays module
displays info module is now working.

Listing still broken
fix listing view

UI needs some polishing
Added back reporting built-in displays

and cleaned UI
keeping historic info is now configurable
simple displays count widget
readme updated
hide empty rows in display listing
Merge pull request #97 from nbalonso/displays-info

Displays info module