Fixes attachment methods

Fixes bug where attachments are attached / embedded twice
Adds clone in TestHelper::getContext() so changes in tests don't affect other tests
Removes generated junit file
Rewrites arrays of the same parameter to a space separated string

The Zend router doesn't support multiple values for one parameter
Merge pull request #3 from nsendetzky/master

Adapts url view helper and adds clone in TestHelper::getContext()
Adapts unit test
Merge pull request #2 from dahoffmann/2013-10-24_FixMW_Mail_Zend_Message

Fixes attachment methods
Improve compliance to mime standard and works around outlook.com behaviour

The mime structure is now standard compliant for embedded files.
For outlook.com files can now be embedded more than once
Complies to coding standards
Works around coding standard problem
Merge pull request #4 from nsendetzky/master

Improve compliance to mime standard and works around outlook.com behaviour