Pull Dot Vote app data into About app

[e18r]

This issue should cover part of the following acceptance criteria:

• Users can add markdown, votes and dot votes widgets

In order to display latest dot vote information the About application needs to be connected with the Dot Voting application as an external contract so that events can be added to the About app state.

This issue covers modifications to the script.js file to connect to the first, or the default, dot voting application as an external contract to receive the event information. In order to connect to the dot voting application, we can use the installedApps endpoint in aragon.js.

a dotVotes object should be loaded into state, with sufficient information to display the following widget: