fix(ngShow): load csp to allow use of ng-show and update ng-show logic

Due to the loading order of angular in a chrome extension, include the angular-csp.css
to allow the operation of ng-show and ng-class. Also, update the ng-show and ng-class
logic.
feat(buffer): buffer messages before devTools open

Before the devTools are opened, messages should be buffered. This way they can
be delivered when the devTools are opened.
fix(reload): refresh messages on reload of inspectedWindow

Messages should not be continually added when the inspectedWindow is refreshed.
When the inspectedWindow is refreshed, start a new list of messages.