Developers: need to update Bower

[Brian Lewis]

Attempting to install new bower package (moment) failed; becuase of changes to bower's hosting arrangements: see:

https://stackoverflow.com/questions/51020317/einvres-request-to-https-bower-herokuapp-com-packages-failed-with-502

Update bower in Visual Studio from the npm tools window, note that the command

npm -g bower

must be typed as

.npm -g bower

@ghachey you'll need this to build the client after upcoming pull requests to address critical issue #382

[Brian Lewis]

everyone who can build must have done this