Updated icons
Merged extension icons and added other sizes for toolbars and navbars
Fixed the imagesets in 1Password.xcassets
Merge pull request #44 from AgileBits/task/update-extension-icons

Updated icons
Added `onepassword-` prefix to the image assets

This should resolve issue #49
Using `onepassword-toolbar` in ACME Browser
Merge pull request #50 from AgileBits/task/add-onepassword-prefix-to-the-assets

Added `onepassword-` prefix to the image assets