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
Added new method to change passwords for existing logins
Added the ability to Change Passwords in 1Password
Use the password generator options when changing passwords.
Remove `NS_EXTENSION_UNAVAILABLE_IOS` for iOS < 8
Merge pull request #53 from dgoldman-ebay/master

Remove `NS_EXTENSION_UNAVAILABLE_IOS` for iOS < 8
Remaned to `kUTTypeAppExtensionChangePasswordAction ` + fixed copy/paste error message
Making sure that we don't pass a nil username
Merge pull request #52 from AgileBits/feature/add-the-ability-to-change-passwords

[NEW] Added the ability to Change Passwords in 1Password.
[IMPROVEMENT] We now make sure that all parameneters are non nil.
We now honor the password generator's minimum and maximum lengths.
Removed extra space. Nice catch @roustem.
Merge pull request #56 from AgileBits/fix/the-password-generator-lengths-are-now-respected

We now honor the password generator's minimum and maximum lengths.
NSAssert is sooo much better.