Move compile options to Emakefile; simplify Makefile.

Emakefile

@@ -1 +1 @@
-{"src/*", [debug_info, {outdir, "ebin"}, {i, "include"}]}.
+{"src/*", [debug_info, warn_unused_vars, warn_unused_import, {outdir, "ebin"}]}.

Makefile

@@ -1,17 +1,7 @@
-SOURCE_FILES := $(wildcard src/*.erl)
-
-
-all: ebin
-
-ebin: ebin/oauth.app $(SOURCE_FILES:src/%.erl=ebin/%.beam)
-
-ebin/oauth.app: src/oauth.app
-	@test -d ebin || mkdir ebin
-	cp src/oauth.app ebin/oauth.app
-
-ebin/%.beam: src/%.erl
+all:
 	@test -d ebin || mkdir ebin
-	erlc -W +debug_info -o ebin $<
+	@cp src/oauth.app ebin/
+	@erl -make
 
 clean:
-	@rm -rf ebin erl_crash.dump
+	@rm -rf ebin/* erl_crash.dump