feat: add pack script

Fixes #4

package.json

@@ -39,6 +39,7 @@
     "@openstapps/logger": "0.0.3",
     "@types/async": "2.0.50",
     "@types/chai": "4.1.7",
+    "@types/del": "3.0.1",
     "@types/glob": "7.1.1",
     "@types/humanize-string": "1.0.0",
     "@types/mocha": "5.2.5",
@@ -49,12 +50,14 @@
     "async-pool-native": "0.1.0",
     "chai": "4.2.0",
     "commander": "2.19.0",
+    "del": "3.0.0",
     "glob": "7.1.3",
     "humanize-string": "1.0.2",
     "jsonschema": "1.2.4",
     "mocha": "5.2.0",
     "mocha-typescript": "1.1.17",
     "mustache": "3.0.1",
+    "toposort": "2.0.2",
     "ts-json-schema-generator": "0.38.1",
     "ts-node": "7.0.1",
     "typedoc": "0.14.0"