updated docblocks in EveAPIXmlDataInterface.
Added YapealPreserverException and YapealRetrieverException.
Update required versions in composer.json for the following: PHP >= 5.3.10, guzzle ~3.9, monolog ~1.9 also added in required-dev for semantic-version and phpunit
added new EveApiXmlFileCachePreserver and EveApiXmlFileCacheRetriever classes.
Update use for PimpleContainer class in yapeal.php