add placeholder text to search field

so people know that they have to add it in such a format
linking find out "more" link to docs
tightening up visual spacing and colors
adding primary buttons to multi-currency

using bootstrap classes to make our buttons look like buttons
Add a settings toggle for showing the rewards list
Add accessor convenience methods to Wallet
Use wallet.get() and wallet.set()
tightening up the send form
Merge pull request #726 from stellar/show-rewards-toggle

Add a settings toggle for showing the rewards list
default to NoRipple
Merge branch 'multi-currency' of https://github.com/stellar/stellar-client into multi-currency-design

Conflicts:
	app/styles/multi-currency.scss
	app/templates/gateways.html
	app/templates/manage-currencies.html
Adds bootstrap alert stylings
Adds addition/deletion alerts for gateways
Merge pull request #728 from stellar/multi-currency-design

Multi-currency design pass
Merge pull request #733 from stellar/mc-alerts

Adds addition/deletion alerts for gateways
Add back 'pay at most' rate for indirect paths
Add sending currency and exchange rate to confirm
Created new directive for <flash-messages>
Forgot to add directive file
Added alert directive