Updated autoload classmap
Build and test updates
Updated MailServiceMock comments
Added getTransport and getRenderer methods to the public API of the MailService
Enhanced ServiceManagerMock to allow to add services after creation
Created many empty files to test attachments behavior of MailService
Enhanced MailServiceFactoryTest to get greater code coverage
Some refactorings in MailService
Enhanced MailServiceTest to get greater code coverage
Enhanced AttachmentsOptionsTest to get greater code coverage
Merge branch 'coverage' into develop