Nested views implemented

I fonund angular.js plugin that allow us to nest views so data doesn't
get lost when switching views.
List of devices displayed in the table format, after clicking on a device, details are shown in the right pane in a tree view. Also filter is working in the middle pane. Now everything is done with angular.
Details transformed into tables. Simple conversion working.
Merge branch 'master' of https://github.com/UnitConversion/unitConversion