Remove redundant/unused project schemes and build settings.
Don’t try to authenticate on launch with empty username or password.
Use LLDB, not GDB.
Use log in/out terminology equivalent to Pandora Web site.

Also fixes some IB warnings.
Disable login button when username/password not specified.
Disable menu and toolbar items when not authenticated to Pandora.
Restore "Control playback with menu keys" target/action connection.

Previously, this checkbox only took effect when you restarted Hermes.
Remove NSObject+SPInvocationGrabbing.

This file put a category on NSObject with non-namespaced method signatures, doesn't use ARC and isn’t really necessary since we can require blocks.

It also wasn't being included in any targets, triggering the exception documented in #172.
SPMediaKeyTap.m uses four-space tabs.