Allow manually adding hardware to user

[GDay]

This adds a button on the colleagues detail page to manually add hardware to a user. This will not create to do items for any other colleagues to fulfill this. This is intended to be used for existing colleagues that already have hardware, which just need to be registered.

[coveralls]

coverage: 89.726% (+0.02%) from 89.707% when pulling ed9f224c496dc4e728fd306177fa703b22c6e4f2 on allow-manually-adding-hardware into 8a4eee67ecf7b247fe10c43bb08f3e3dcfe642c0 on master.