MULE-7088: Improve the way Mime types are registered for outbound http attachments

Removed dependency between http and email transport by using custom data sources that don't require Mime types to be previously registered.
Merge pull request #160 from mulesoft/MULE-7088

MULE-7088: Improve the way Mime types are registered for outbound http attachments
MULE-7077: Changed Spring security manager to be created in standalone mode.

Also changed the HTTP basic filter to refer to a security manager.
Merge pull request #163 from mulesoft/MULE-7077b

MULE-7077: Changed Spring security manager to be created in standalone m...
MULE-7110 - improve jms endpoint reconnection
Merge pull request #165 from mulesoft/MULE-7110

MULE-7110 - improve jms endpoint reconnection
Merge branch 'mule-3.x' into MULE-7052

Conflicts:
	transports/jms/src/main/java/org/mule/transport/jms/JmsConnector.java