[FIX] Only rules regarding encrypted and signed messages are re-applied.
Merge branch 'dev' of https://github.com/GPGTools/GPGMail into dev
[FIX] Verify GPGMail's bundle signature and abort to load if verification fails.

- Use SecStaticCodeCheckValidityWithErrors with kSecCSDefaultFlags flags,
  so that the verification makes sure that bundle contents have not changed,
  the main executable has not been tampered with and if other code within
  the bundle has also not been modified.
Don't run signature verification on debug builds.
Better XIB handling.
debug install rm -f added.
Allow unsigned GPGMail.
[FIX] Installer: Disable Mail.app 32-bit mode if needed.
Merge branch 'dev' of https://github.com/GPGTools/GPGMail into dev
Fix AssertionFailure when using inline PGP for composing.
[NEW] Check if GPGMail is signed by us.
Merge
[FIX] Further improve signed & encrypted rule applier. [#645 state:fixed]

- Rules are now only applied once for each encrypted & signed message.
  In case a message is encrypted it is still evaluated until its once
  decrypted. After that no longer
- The message ids are recorded in a defaults file.
Merge branch 'dev' of https://github.com/GPGTools/GPGMail into dev
Cache _rulesDict
Move dispatch_once outside dispatch_async.
Version 2.0.1