Update module/VuFind/src/VuFind/ILS/Driver/Aleph.php

Bugfix: Only convert month part from string to number if not already provided as number.
Error occures when input date has this format: 31/12/2013
Additional cleanup: Replaced deprecated split() with explode()
Streamlined and documented entity cleanup within stored MARC records.
Adding MultiBackend driver (VUFIND-643).
Decoupled resolver drivers from config reader.
Fixed resolver drivers to use HTTP client instead of file_get_contents; this adds proxy support and improves testability.
Started loading configurations through a custom plugin manager instead of static \VuFind\Config\Reader.
Use plugin manager instead of config\reader.
Merge branch 'master' of git://vufind.git.sourceforge.net/gitroot/vufind/vufind into bsbvf2
More elimination of static config\reader calls.
Eliminated static config\reader call.
Created mailer factory to better separate VuFind-specific configuration issues from actual mailer functionality.
Inject configuration to record router.
More config reader decoupling.
Fixed broken test.
Style fixes.
Added missing comment.
Added comments.
Decoupled VoyagerRestful driver from ILS\Connection.
Removed unused use statement.
Created class for managing holds configuration; eliminated some static calls/methods and a circular dependency.