Add Makefile for building web assets

.Rbuildignore

@@ -8,3 +8,4 @@
 ^run\.R$
 ^\.gitignore$
 ^res$
+^tools$

tools/.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+

tools/Makefile

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+UGLIFY = ./node_modules/.bin/uglifyjs 
+
+# Directory of bootstrap datepicker
+DATEPICKER = ../inst/www/shared/datepicker/js/
+
+all: $(DATEPICKER)/bootstrap-datepicker.min.js
+
+clean:
+	rm -f $(DATEPICKER)/bootstrap-datepicker.min.js
+
+
+$(DATEPICKER)/bootstrap-datepicker.min.js: $(DATEPICKER)/bootstrap-datepicker.js \
+	                    $(wildcard $(DATEPICKER)/locales/bootstrap-datepicker.*.js)
+	$(UGLIFY) \
+	  $(DATEPICKER)/bootstrap-datepicker.js \
+	  $(DATEPICKER)/locales/bootstrap-datepicker.*.js \
+	  --output $(DATEPICKER)/bootstrap-datepicker.min.js

tools/README.md

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+The contents in this subdirectory are used for building web assets.
+
+To build, install the requirements (below), then go to this directory and run:
+
+```
+make
+```
+
+## Requirements
+
+### UglifyJS
+
+UglifyJS is a module for node.js which minifies Javascript files. It should be
+installed with the following command (run from this directory):
+
+```
+npm install uglify-js
+```
+
+This will install the UglifyJS into `./node_modules/`.