Turn on all of Microsoft's recommend lint rules

Biggest changes forced by this: alt tags for all images, resulting in
new strings added to messages.json, and a new i18n paramter/prop added
in a plot of places.

Another change of note is that there are two new tslint.json files under
ts/test and ts/styleguide to relax our rules a bit there. This required
a change to our package.json script, as manually specifying the config
file there made it ignore our tslint.json files in subdirectories

ts/components/conversation/Message.tsx

@@ -1,3 +1,5 @@
+// tslint:disable:newline-before-return
+
 import React from 'react';
 
 /**
@@ -5,7 +7,7 @@ import React from 'react';
  * none of the dynamic functionality. This page will be used to build up our corpus of
  * permutations before we start moving all message functionality to React.
  */
-export class Message extends React.Component<{}, {}> {
+export class Message extends React.Component {
   public render() {
     return (
       <li className="entry outgoing sent delivered">