Better error messages / handling for send validation.

[haustraliaer]

Currently I've just implemented a simple function (here: 7fbac19) for stopping the user from sending unless they have entered something into the address bar and also checking if they have enough funds.

If the checks are met, then clicking confirm takes them to the send confirmation step.

Ideally the confirm button shouldn't seem like it is able to be clicked until the checks are met, so perhaps we should test on keyup etc as well. Also there should be some visual validation as to what they have got incorrect if they try and click confirm but it fails.

[haustraliaer]

I've now set it up with contextual error popups - but this probably still needs some inline highlighting of the specific fields in question. And I think the error module should probably get some more love in regards to icons as it's currently using a temporary png.

[weilu]

@haustraliaer nice! Is this using the error-modal module?

[haustraliaer]

Yep using the error component, though we might be able to tidy up the validation functions a bit - I'll leave that for the code review.

[weilu]

@haustraliaer I've reworked the send validation. Are there more to do for this ticket?

[haustraliaer]

All done here but a new issue has come up -> #132