Added minified jquery lib to the build system.

external/rules.mk

@@ -1,4 +1,4 @@
-TGT_DIR += $(b)pybison
+TGT_DIR += $(b)pybison $(b)jquery
 
 PYBISON_INC := -Iexternal/pybison/src/c -I/usr/include/python2.7
 
@@ -30,3 +30,9 @@ endif
 $(b)pybison/%.c: $(d)pybison/src/pyrex/%.pyx
 	$(py2c) $(py2c_OPTS) -o $@ $<
 	$(RM) $(@D)/*.so
+
+build: $(b)jquery/jquery.min.js
+
+$(b)jquery/jquery.min.js: $(d)jquery/version.txt | $(b)jquery
+	$(MAKE) -C external/jquery
+	ln -sf ../../../$(<D)/dist/jquery.min.js $@