Update travel fund processes (#132)

* Update travel fund processes

There have been some questions about how we administer the travel fund, and concerns raised about the case when someone has made a request beyond what has been allocated (see issue #99). To address some concerns with how we administer the travel-fund, add some notes:

- Clarify that a request is fully approved once the pull request has landed.
- Add a note about a treasurer role, who will liason regularly with a member from the foundation to ensure that the allocated budget for the year (vs what's already been requested) hasn't been exceeded.
- Add a note around submitting for reimbursement in a timely fashion.

Closes #99

MEMBER_TRAVEL_FUND.md

@@ -37,6 +37,8 @@ A request is approved when all of the following criteria are met:
   will always require at least four approvals.)
 * No members of either @nodejs/tsc or @nodejs/community-committee have objected
   to the request.
+* The pull request has been merged. Any member may merge once other 
+  prerequisites have been met. 
 
 If a request is blocked by an objection from a member of @nodejs/tsc or
 @nodejs/community-committee, then the only way for the request to be approved is
@@ -45,6 +47,13 @@ decision-making process the  committee uses when consensus is not reached. (For
 example, for the TSC, there is a voting process to make decisions when consensus
 cannot be reached.)
 
+An appointed treasurer from either the @nodejs/tsc or @nodejs/community-committee
+(or both) will liaise with a member of the Node.js Foundation on a regular basis 
+to review the status of the travel fund. In the event that any pending requests 
+might not be approved because of available funds, a separate issue will be raised.
+Generally speaking, however, members shouldn't need to worry about the status
+of the fund itself.
+
 **The following considerations are made for approval of the request:**
 
 * Impact: Preference given to underserved communities. More specifically,
@@ -63,13 +72,17 @@ Collaborator Summit, and Code + Learn mentoring.
 
 ### Reimbursement
 
-Once the request has been approved, you must:  
+Once the request has been approved, you must: 
+
 1. Provide receipts as attachments in an email stating your name, the participation covered,
 and the total approved for reimbursement. 
 2. Fill out and attach the [Expense Report](./expense-report-template.xls?raw=true).
 3. Email this reimbursement request to ap@linuxfoundation.org and cc
 mrhinkle@linuxfoundation.org and annmarie@thisdot.co. 
 
+Submit reports within one calendar month of the event date. Submitting reports
+in a timely fashion facilitates accurate record-keeping.
+
 Due to privacy, the Individual Members list is not public. This team will verify the
 requester is on the Individual Members list before funds are disbursed. This
 disbursement is generally processed within 30 days. The community manager or a