Remove cson2json dependency

The latest release does not work because of CoffeeScript
changes so use a simple compile script to convert CSON
files to JSON files when buildilng.

Closes #348

package.json

@@ -3,8 +3,7 @@
   "version" : "0.0.0",
 
   "dependencies": {
-    "coffee-script": "1.5",
-    "cson": "1.x"
+    "coffee-script": "1.5"
   },
 
   "scripts": {

script/compile-cson

@@ -11,4 +11,4 @@ node --version > /dev/null 2>&1 || source /opt/github/env.sh
 INPUT_FILE="${1}"
 OUTPUT_FILE="${2}"
 
-node_modules/.bin/cson2json "${INPUT_FILE}" > "${OUTPUT_FILE}"
+node_modules/.bin/coffee script/compile-cson.coffee -- "${INPUT_FILE}" "${OUTPUT_FILE}"

script/compile-cson.coffee

@@ -0,0 +1,23 @@
+fs = require 'fs'
+{exec} = require 'child_process'
+
+inputFile = process.argv[2]
+unless inputFile?.length > 0
+  console.error("Input file must be first argument")
+  process.exit(1)
+
+outputFile = process.argv[3]
+unless outputFile?.length > 0
+  console.error("Output file must be second arguments")
+  process.exit(1)
+
+contents = fs.readFileSync(inputFile)?.toString() ? ''
+exec "node_modules/.bin/coffee -bcp #{inputFile}", (error, stdout, stderr) ->
+  if error
+    console.error(error)
+    process.exit(1)
+  json = eval(stdout.toString()) ? {}
+  if json isnt Object(json)
+    console.error("CSON file does not contain valid JSON")
+    process.exit(1)
+  fs.writeFileSync(outputFile, JSON.stringify(json, null, 2))