This might deserve its own class if it ever needs to be reused in the future.

Note: this will create some inefficiency until \VuFind\Config\Reader is factored out of code; in some cases, configurations will load twice.  Should be sorted out soon.

Created getConfig convenience method in base controller; used this to eliminate several Config\Reader calls.

Simplified some method signatures thanks to the new dependency injection approach.
Decoupled ILS\Logic classes from Config\Reader.

Created class for managing holds configuration; eliminated some static calls/methods and a circular dependency.

Created mailer factory to better separate VuFind-specific configuration issues from actual mailer functionality.

Started loading configurations through a custom plugin manager instead of static \VuFind\Config\Reader.

Fixed resolver drivers to use HTTP client instead of file_get_contents; this adds proxy support and improves testability.

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()