Use case-insensitive sort for token dropdown

[freeatnet]

We've started adding tokens that have lower-cased characters in their symbols. That puts them at a disadvantage in the token dropdown, where they appear at the bottom. We should use case-insensitive sort for token dropdown.

[lampshade9909]

The URL for the webpage is also case sensitive and should be case insensitive

https://forkdelta.github.io/#!/trade/dgd-ETH

becomes

https://forkdelta.github.io/#!/trade/undefined-ETH

when dgd should resolve to DGD