Updated formatting on Java classes and Maven POMs per code style guidelines specified in https://github.com/greenmail-mail-test/greenmail/pull/9
Modified JavaMail dependency in greenmail-parent POM and greenmail-core POM as requested in https://github.com/greenmail-mail-test/greenmail/pull/9
Merge branch 'issue-4'
Added fix for issue - https://github.com/greenmail-mail-test/greenmail/issues/4. GreenMail will now escape the message-id field of a fetched email prior to it being added to a mail enevelope.
Added dependency on Apache Commons Lang to use a helper/utility class that escapes Java strings