Pair reordering

adapting what @vhpoet did in 

77a11af
 and
1a44e94

to close #265. This time is to order the currency pairs at the trade page.
Now it is tested and corrected, the previous pull request was flawed.
There's also a node script to deploy a simple server copied from https://github.com/angular/angular-phonecat/blob/master/scripts/web-server.js

And there's also a TODO comment, I don't know what $scope.xrp serves for, but with reordering it may be not the first currency in the list.
I'm not sure what would have been the best to do about it though.

Sorry for not separating this somehow, but I'm still a novice git user.