added mailgun module

sites/all/libraries/mailgun/CHANGELOG.md

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+## 1.7 (2014-1-30)
+
+Bugfixes:
+  - patched bug for attachments related to duplicate aggregator bug in Guzzle (#32 @travelton)
+
+## 1.6 (2014-1-13)
+
+Enhancement:
+  - adjust file attachment/inline name (#21 @travelton)
+
+Bugfixes:
+  - fixed issue with unordered route actions (#23 @travelton)
+
+## 1.5 (2013-12-13)
+
+Enhancement:
+  - added ability to define non-https endpoint for debugging purposes (#23 @travelton)
+
+## 1.4 (2013-10-16)
+
+Bugfixes:
+  - template IDs were missing from recipient-variables (#15 @travelton)
+  - batch jobs trigger on to, cc, and bcc (#18 @travelton)
+  - batch jobs include recipient-variables for to, cc, and bcc (#18 @travelton)
+  - added method to return message-ids, for easier access (#19 @travelton)
+
+## 1.3 (2013-09-12)
+
+Bugfixes:
+  
+  - relaxed Guzzle requirement (#7 @travelton)
+  - fixed reply-to bug (#9 @travelton)
+
+## 1.2 (2013-09-05)
+
+Bugfixes:
+
+  - fixed exception handling constants (@travelton)
+  - fixed MessageBuilder $baseAddress return (#1 @yoye)
+  - adjusted scope of recipient-variables (#3 @yoye)
+  - fixed misspellings of Exceptions (#2 @dboggus)
+  - undefined DEFAULT_TIME_ZONE (#4 @yoye)
+  - added message IDs to return for BatchMessage (@travelton)
+
+## 1.1 (2013-08-21)
+
+Initial Release!