iOS 7.0 No code signing identities found

For Certificate

1. Revoke Previous Certificate.
2. Generate New Development Certificate.
3. Download Certificate.
4. Double Click to put in KeyChain.

For Provisioning profile

1. Create New or Edit existing Provisioning profile.
2. Download and install.

For BundleIdentifier.

1. com.yourcompanyName.Something (Put same as in AppId)

CodeSigningIdentity.

1. Select The Provisioning profile which you created.

My fix for this problem was:

Xcode > Preferences. In Accounts click on your Apple ID. Click View Details, click on your projects Provisioning Profile (I think this helps) and click the refresh button bottom left.