tsc: adjust TSC membership for IBM+StrongLoop

Following the IBM+StrongLoop announcement last week, we
(@piscisaureus, @bnoordhuis, @srl295, @mhdawson, and myself)
want to take a moment to reiterate our personal commitment
to Node.js and the Foundation.

Per the TSC rules, any one company is limited to no more than
1/4 of the voting seats on the TSC and after talking it over
amongst ourselves, @srl295 and @mhdawson have elected to step
back from the TSC for now.

What I would propose is that they continue to participate in the
weekly TSC meetings as observers; and that once the membership
expands, they be considered once again for full TSC status.

Both Steven and Michael will continue to be actively involved
with Node.js. Both are active members of various Working Groups.
(Michael chairs the Benchmarking workgroup and Steven chairs the
Intl workgroup.)

/cc @nodejs/tsc

Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Fedor Indutny <fedor@indutny.com>
Reviewed-By: Alexis Campailla <orangemocha@nodejs.org>
Reviewed-By: Rod Vagg <r@va.gg>
Reviewed-By: Trevor Norris <trevnorris@nodejs.org>
PR-URL: #2858

Author: jasnell

README.md

@@ -337,14 +337,12 @@ information about the governance of the Node.js project, see
 * [fishrock123](https://github.com/fishrock123) - **Jeremiah Senkpiel** <fishrock123@rocketmail.com>
 * [indutny](https://github.com/indutny) - **Fedor Indutny** <fedor.indutny@gmail.com>
 * [jasnell](https://github.com/jasnell) - **James M Snell** <jasnell@gmail.com>
-* [mhdawson](https://github.com/mhdawson) - **Michael Dawson** <michael_dawson@ca.ibm.com>
 * [misterdjules](https://github.com/misterdjules) - **Julien Gilli** <jgilli@nodejs.org>
 * [mscdex](https://github.com/mscdex) - **Brian White** <mscdex@mscdex.net>
 * [orangemocha](https://github.com/orangemocha) - **Alexis Campailla** <orangemocha@nodejs.org>
 * [piscisaureus](https://github.com/piscisaureus) - **Bert Belder** <bertbelder@gmail.com>
 * [rvagg](https://github.com/rvagg) - **Rod Vagg** <rod@vagg.org>
 * [shigeki](https://github.com/shigeki) - **Shigeki Ohtsu** <ohtsu@iij.ad.jp>
-* [srl295](https://github.com/srl295) - **Steven R Loomis** <srloomis@us.ibm.com>
 * [trevnorris](https://github.com/trevnorris) - **Trevor Norris** <trev.norris@gmail.com>
 
 ### Collaborators
@@ -359,6 +357,7 @@ information about the governance of the Node.js project, see
 * [joaocgreis](https://github.com/joaocgreis) - **João Reis** <reis@janeasystems.com>
 * [julianduque](https://github.com/julianduque) - **Julian Duque** <julianduquej@gmail.com>
 * [lxe](https://github.com/lxe) - **Aleksey Smolenchuk** <lxe@lxe.co>
+* [mhdawson](https://github.com/mhdawson) - **Michael Dawson** <michael_dawson@ca.ibm.com>
 * [micnic](https://github.com/micnic) - **Nicu Micleușanu** <micnic90@gmail.com>
 * [mikeal](https://github.com/mikeal) - **Mikeal Rogers** <mikeal.rogers@gmail.com>
 * [monsanto](https://github.com/monsanto) - **Christopher Monsanto** <chris@monsan.to>
@@ -371,6 +370,7 @@ information about the governance of the Node.js project, see
 * [sam-github](https://github.com/sam-github) - **Sam Roberts** <vieuxtech@gmail.com>
 * [seishun](https://github.com/seishun) - **Nikolai Vavilov** <vvnicholas@gmail.com>
 * [silverwind](https://github.com/silverwind) - **Roman Reiss** <me@silverwind.io>
+* [srl295](https://github.com/srl295) - **Steven R Loomis** <srloomis@us.ibm.com>
 * [targos](https://github.com/targos) - **Michaël Zasso** <mic.besace@gmail.com>
 * [tellnes](https://github.com/tellnes) - **Christian Tellnes** <christian@tellnes.no>
 * [thefourtheye](https://github.com/thefourtheye) - **Sakthipriyan Vairamani** <thechargingvolcano@gmail.com>