TODO list

Support GnuPG 2
Introduce gnupg_geterrorinfo with more info about the error
- including error message from gpgme
Allow setting engine info on object construction
- Add __construct / res init with gpgme_ctx_set_engine_info
- https://github.com/php-gnupg/php-gnupg/issues/7
Return decrypt result if extra param supplied (including recipients)
- https://github.com/php-gnupg/php-gnupg/pull/12
Add parameter to gnupg_keyinfo to use secret_only on gpgme_op_keylist_start
- https://github.com/php-gnupg/php-gnupg/issues/5
Extend gnupg_keyinfo subkey result with pubkey_algo and length
- https://github.com/php-gnupg/php-gnupg/issues/6
Add support for exporting multiple keys using gpgme_op_export_ext
- https://github.com/php-gnupg/php-gnupg/issues/10
Add missing tests for following functions:
- gnupg_geterror
- gnupg_getprotocol
- gnupg_clearsignkeys
- gnupg_clearencryptkeys
- gnupg_cleardecryptkeys
- gnupg_gettrustlist
Create new README.md
Update PHP.net documentation