Ubermedia has released an update to its Twitter client for the iPhone and iPod touch adding a redesigned user interface and support for skinning the UI with custom themes. Formerly known as UberTwitter, UberSocial 1.7 also adds support for new branded content channels from UberMedia partners such as USA Today, Mashable, The Hollywood Reporter and more. The new version also provides support for viewing photos in-stream, multiple accounts and the ability…