Incorrect package name fix

Fixed incorrect package name #51 @steveWinter

Several pull requests approved

See:
#27 #50 #41 #40 #42 #49

Fixed issue and improved decrypting

The decryption-task make use of the performant query-iterator and the nice progress bar feature. thanks to @michaelfeinbier
Fixed Bug: #11

Improvements to database sync commands and addition to the documentation

Small update with the following additions:

CLI performance on batch encryption - thanks to @michaelfeinbier #17
Documentation addition to store the key in a file - thanks to @jreziga #16

Several small improvements

Fix CLI performance on large sized databases - thanks to: @wcoppens
Improved readability in readme - thanks to: @jongotlin
Add support for embedded entities - thanks to: @BboyKeen

Changed package requirements

Changed requirements, the question helper was introduced in Symfony >= 2.5.

Replaced deprecated dialog helper for commands with question helper

Replaced deprecated dialog helper for commands with the question helper for support for Symfony >= 3.0

Ignored MappedSuperclass

The commands tried to access tables related to mapped super class, which did not exist.
Thanks to @wassefr for this addition.

Added postFlush event

Added postFlush event, entities which are flushed are now directly decrypted after the flush for futher usage in code.

Added services

Added service for the use in container aware classes.
Really useful for finding encrypted data, example:

$encryptedName = $this->get('ambta_doctrine_encrypt.encryptor')->encrypt($name);
$settingEntity = $settingRepository->findOneBy(array('name' => $encryptedName));