Rename contributor to recipient

And remove addedBy entry.

lib/contracts/reimbursement.js

@@ -23,7 +23,7 @@ class Reimbursement extends Record {
   async add (attrs, callOptions = {}) {
     const amount = parseInt(attrs.amount);
     const token = attrs.token;
-    const contributorId = attrs.contributorId;
+    const recipientId = attrs.recipientId;
     const expenses = attrs.expenses.map( e => new ExpenseSerializer(e) );
     let errorMessage;
 
@@ -33,8 +33,8 @@ class Reimbursement extends Record {
     if (!token || token === '') {
       errorMessage = 'Invalid data: token must be a token address.';
     }
-    if (!contributorId || contributorId === '') {
-      errorMessage = 'Invalid data: contributorId is required.';
+    if (!recipientId || recipientId === '') {
+      errorMessage = 'Invalid data: recipientId is required.';
     }
     if (expenses.length === 0) {
       errorMessage = 'Invalid data: at least one expense item is required.';
@@ -50,7 +50,7 @@ class Reimbursement extends Record {
             const reimbursement = [
               amount,
               token,
-              parseInt(contributorId),
+              parseInt(recipientId),
               ipfsHashAttr.hashDigest,
               ipfsHashAttr.hashFunction,
               ipfsHashAttr.hashSize,