Adds support for starting an http server

Signed-off-by: Christopher Rogers <chrissrogers@gmail.com>

Makefile

@@ -1,17 +1,20 @@
 BIN = node_modules/.bin
 WEBPACK = $(BIN)/webpack
 KARMA = $(BIN)/karma
-SERVER = $(BIN)/webpack-dev-server --inline --hot --port 8020 --https
+SERVER = $(BIN)/webpack-dev-server --inline --hot --port 8020
 SRC = index.js $(shell find lib -type f -name '*.js')
 TESTS = $(shell find test -type f -name '*.js')
 
 server: build
 ifdef RECURLY_JS_CERT
-	@$(SERVER) --cert $(RECURLY_JS_CERT) --key $(RECURLY_JS_KEY)
+	@$(SERVER) --https --cert $(RECURLY_JS_CERT) --key $(RECURLY_JS_KEY)
 else
-	@$(SERVER)
+	@$(SERVER) --https
 endif
 
+server-http: build
+	@$(SERVER)
+
 build: build/recurly.min.js
 
 build/recurly.js: index.js $(SRC) node_modules