Switch profile to auto layout.
Fix German translation.
Add constraints to HIProfileViewController.
Replace bitcoin icon with popup button.
Fill pop up button with format options.
Store preferred bitcoin format.
Format Bitcoin amounts according to selected format.
Layout send window to include Bitcoin format selector.
Use format service everywhere.
Connect format switch in send window.
Make popup button wider to fit label.
Change default from BTC to mBTC.
#122: Switch to mBTC.