Incorporate modified darcyclarke/Detect.js for browser/device detection

Author: curtisliu

Makefile

@@ -1,8 +1,14 @@
-SRC = $(wildcard lib/*.js)
+SRC = $(wildcard src/*.js)
 BINS = node_modules/.bin
 DUO = $(BINS)/duo
 MINIFY = $(BINS)/uglifyjs
 
+#
+# Default target.
+#
+
+default: amplitude.js
+
 #
 # Clean.
 #