encrypt 7.x-2.1-rc1

The changes is this version did not affect the core functionality of Encrypt, so there should be no compatibility issues with prior versions.

Changes since 7.x-2.0:

• #2371789 by rlhawk, Cellar Door: Make configuration available in the encryption callback function.
• #2354423 by rlhawk: Create function for saving a configuration.
• #2281341 by rlhawk: Integration with Features to allow for settings export.
• #2401681 by rlhawk: Pass configuration to encryption method callback as argument.
• #2498745 by Heine: Use drupal_random_bytes to generate a key
• #2386819 by Deciphered: Encrypt/Decrypt and cache clear issue with CTools plugin system
• #2486217 by rlhawk: Make configuration available in the key callback function