Integrate erc721 erc20 template contracts

package.json

@@ -25,6 +25,8 @@
     "changelog": "auto-changelog -p",
     "prepublishOnly": "npm run build",
     "test:pool": "mocha --config=test/unit/.mocharc.json --node-env=test --exit 'test/unit/pools/balancer/Pool.test.ts'",
+    "test:dt": "mocha --config=test/unit/.mocharc.json --node-env=test --exit 'test/unit/Datatoken.test.ts'",
+    "test:nftDt": "mocha --config=test/unit/.mocharc.json --node-env=test --exit 'test/unit/NFTDatatoken.test.ts'",
     "test:router": "mocha --config=test/unit/.mocharc.json --node-env=test --exit 'test/unit/pools/Router.test.ts'",
     "test:unit": "mocha --config=test/unit/.mocharc.json --node-env=test --exit 'test/unit/**/*.test.ts'",
     "test:unit:cover": "nyc --report-dir coverage/unit npm run test:unit",
@@ -47,14 +49,15 @@
   },
   "dependencies": {
     "@ethereum-navigator/navigator": "^0.5.3",
-    "@oceanprotocol/contracts": "https://github.com/oceanprotocol/contracts#v4main",
+    "@oceanprotocol/contracts": "github:oceanprotocol/contracts#v4main",
     "cross-fetch": "^3.1.4",
     "crypto-js": "^4.0.0",
     "decimal.js": "^10.2.1",
     "fs": "0.0.1-security",
     "lzma": "^2.3.2",
     "node-abort-controller": "^2.0.0",
     "save-file": "^2.3.1",
+    "underscore": "^1.13.1",
     "uuid": "^8.3.2",
     "web3": ">=1.3.5",
     "web3-core": "^1.5.3",