Add seeds script

Allows to seed the smart contract with development data specified in
config/seeds.js

Usage:

truffle exec scripts/seeds.js

or

npm run bootstrap which runs them all:
* truffle migrate --reset
* truffle exec scripts/seeds.js
* npm run build-json

config/seeds.js

@@ -0,0 +1,63 @@
+let contractCalls = {
+  Operator: {
+    addContributor: [
+      // make sure to use an IPFS hash of one of the objects in ipfsContent
+      ['0x24dd2aedd8a9fe52ac071b3a23b2fc8f225c185e', '0x272bbfc66166f26cae9c9b96b7f9590e095f02edf342ac2dd71e1667a12116ca', 18, 32, true], // QmQyZJT9uikzDYTZLhhyVZ5ReZVCoMucYzyvDokDJsijhj
+      ['0xa502eb4021f3b9ab62f75b57a94e1cfbf81fd827', '0x9569ed44826286597982e40bbdff919c6b7752e29d13250efca452644e6b4b25', 18, 32, true] // QmYPu8zvtfDy18ZqHCviVxnKtxycw5UTJLJyk9oAEjWfnL
+    ],
+    addProposal: [
+      [1, 23, 'QmQNA1hhVyL1Vm6HiRxXe9xmc6LUMBDyiNMVgsjThtyevs'],
+      [2, 42, 'QmQNA1hhVyL1Vm6HiRxXe9xmc6LUMBDyiNMVgsjThtyevs']
+      [2, 100, 'QmQNA1hhVyL1Vm6HiRxXe9xmc6LUMBDyiNMVgsjThtyevs']
+    ],
+    vote: [
+      [1]
+    ]
+  }
+};
+let ipfsContent = [
+  {
+    "@context": "https://schema.kosmos.org",
+    "@type": "Contributor",
+    "kind": "person",
+    "name": "Râu Cao",
+    "url": "https://sebastian.kip.pe",
+    "accounts": [
+      {
+        "site": "github.com",
+        "username": "skddc",
+        "uid": 842,
+        "url": "https://github.com/skddc/"
+      },
+    ]
+  },
+  {
+    "@context": "https://schema.kosmos.org",
+    "@type": "Contributor",
+    "kind": "person",
+    "name": "Bumi",
+    "url": "https://michaelbumann.com",
+    "accounts": [
+      {
+        "site": "github.com",
+        "username": "bumi",
+        "uid": 318,
+        "url": "https://github.com/bumi/"
+      },
+    ]
+  },
+  {
+    "@context": "https://schema.kosmos.org",
+    "@type": "Contribution",
+    "contributor": {
+      "ipfs": "QmQ2ZZS2bXgneQfKtVTVxe6dV7pcJuXnTeZJQtoVUFsAtJ"
+    },
+    "kind": "dev",
+    "description": "hacking hacking on kredits",
+    "url": "https://github.com/67P/kredits-web/pull/11",
+    "details": {}
+  }
+
+]
+
+module.exports = { contractCalls, ipfsContent };