Fix Makefile so that we can compile

The functionality has been ported from cider, we can now use the make command
to install elpa packages and compile. This is still not perfect because in
theory we should not install things from elpa if we have them in our Emacs but
it would take more work for achieving that.

Author: arichiardi

.gitignore

@@ -6,3 +6,4 @@
 # Emacs byte-compiled files
 *.elc
 .cask
+elpa*

Makefile

@@ -8,14 +8,23 @@ PKGDIR := $(shell EMACS=$(EMACS) $(CASK) package-directory)
 SRCS = $(wildcard *.el)
 OBJS = $(SRCS:.el=.elc)
 
-.PHONY: compile test clean
+.PHONY: compile test clean elpa
 
-elpa:
+all: compile
+
+elpa-$(EMACS):
 	$(CASK) install
 	$(CASK) update
 	touch $@
 
-compile: $(OBJS)
+elpa: elpa-$(EMACS)
+
+elpaclean:
+	rm -f elpa*
+	rm -rf .cask # Clean packages installed for development
+
+compile: elpa
+	$(CASK) build
 
 clean:
 	rm -f $(OBJS)