add makefile command to make authors list

Author: Kevin Burke

AUTHORS

@@ -0,0 +1,35 @@
+Authors
+=======
+
+A huge thanks to all of our contributors:
+
+
+- Adam Ballai 
+- Adam Rich 
+- Adam Richeimer 
+- Andrew Benton 
+- Beans0063 
+- Brett Gerry 
+- Brian Levine 
+- Carlos Diaz-Padron 
+- Christer Fahlgren 
+- ChristerF 
+- Christopher C. Merris 
+- D Keith Casey Jr 
+- Doug Black 
+- Eric Anderle 
+- Frank 
+- Frank Stratton 
+- Girish Bharadwaj 
+- Guillaume BINET 
+- Jancsi Farkas 
+- Jason Li 
+- Jon Plax 
+- Kevin Burke 
+- Kevin Whinnery 
+- Kyle 
+- Kyle Conroy 
+- RonaldWentworth 
+- Sam Kimbrel 
+- Thomas Wilsher 
+- rschiffert@twilio.com 

AUTHORS.md

@@ -1,6 +1,6 @@
 # In this case the Makefile is fairly simple. Still providing it to provide
 # consistency with other helper libraries
-.PHONY: test install clean
+.PHONY: test install clean authors
 
 install:
 	mvn install
@@ -10,3 +10,7 @@ test:
 
 clean:
 	rm -rf target
+
+authors:
+	echo "Authors\n=======\n\nA huge thanks to all of our contributors:\n\n" > AUTHORS.md
+	git log --raw | grep "^Author: " | cut -d ' ' -f2- | cut -d '<' -f1 | sed 's/^/- /' | sort | uniq >> AUTHORS.md