added Ocean.tokens module

package.json

@@ -3,6 +3,7 @@
   "version": "0.3.0",
   "description": "JavaScript client library for Ocean Protocol",
   "main": "./dist/node/squid.js",
+  "typings": "./dist/node/squid.d.ts",
   "browser": "./dist/browser/squid.cjs2.min.js",
   "scripts": {
     "test": "mocha",

src/keeper/contracts/Token.ts

@@ -18,4 +18,8 @@ export default class OceanToken extends ContractBase {
         return this.call("balanceOf", [address])
             .then((balance: string) => new BigNumber(balance).toNumber())
     }
+
+    public async transfer(to: string, amount: number, from: string): Promise<boolean> {
+        return this.send("transfer", from, [to, amount])
+    }
 }

src/ocean/OceanTokens.ts

@@ -0,0 +1,54 @@
+import Keeper from "../keeper/Keeper"
+import Account from "./Account"
+
+/**
+ * Tokens submodule of Ocean Protocol.
+ */
+export default class OceanTokens {
+
+    /**
+     * Returns the instance of OceanTokens.
+     * @return {Promise<OceanTokens>}
+     */
+    public static async getInstance(): Promise<OceanTokens> {
+        if (!OceanTokens.instance) {
+            OceanTokens.instance = new OceanTokens()
+        }
+
+        return OceanTokens.instance
+    }
+
+    /**
+     * OceanTokens instance.
+     * @type {OceanTokens}
+     */
+    private static instance: OceanTokens = null
+
+    /**
+     * Transfer a number of tokens to the mentioned account.
+     * @param  {string}           to     Address that receives the account.
+     * @param  {number}           amount Tokens to transfer.
+     * @param  {Account}          from   Sender account address.
+     * @return {Promise<boolean>}        Success,
+     */
+    public async transfer(to: string, amount: number, from: Account): Promise<boolean> {
+        return (await Keeper.getInstance())
+            .token
+            .transfer(to, amount, from.getId())
+    }
+
+    /**
+     * Request tokens for a account.
+     * @param  {Account}          account Account instance.
+     * @param  {number}           amount  Token amount.
+     * @return {Promise<boolean>}         Success.
+     */
+    public async request(account: Account, amount: number): Promise<boolean> {
+        try {
+            await account.requestTokens(amount)
+            return true
+        } catch(e) {
+            return false
+        }
+    }
+}