Update lib/classes/Swift/MemorySpool.php
Implemented Swift_Message cloning + test
corrected typo
Merge branch 'master' of https://github.com/bmurashin/swiftmailer into message_cloning
Cloning fixed
Added Message-Id regeneration
Bugfix, message might change when in the memory spool
Added comment
Merge branch 'message_cloning' of https://github.com/xdecock/swiftmailer into xdecock

Conflicts:
	lib/classes/Swift/Mime/SimpleHeaderFactory.php
Using clone
Added clone function
feature #519 [MemorySpool] Cloning messages to the queue (bmurashin, xdecock, Nyholm)

This PR was merged into the 5.2-dev branch.

Discussion
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[MemorySpool] Cloning messages to the queue

This PR is a merge of #278 and #518. With help from @xdecock we got the cloning to work.

I need some advice about the failing test. I suspect this is a false positive. Am I correct when saying that properties of the message does not need to be cloned? If not, the test is valid and we (or I ?) need to do some more changes to this PR.

Commits
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65dcc5e Added clone function
d78c9a4 Using clone
0ddc383 Merge branch 'message_cloning' of https://github.com/xdecock/swiftmailer into xdecock
d3bcae1 Added comment
9d52c5f Bugfix, message might change when in the memory spool
1d14c0b Added Message-Id regeneration
5a89730 Cloning fixed
1806788 Merge branch 'master' of https://github.com/bmurashin/swiftmailer into message_cloning
03508cc corrected typo
b6eefd3 Implemented Swift_Message cloning + test
e764fe5 Update lib/classes/Swift/MemorySpool.php