Moved extend implementation to its own micromodule, might help with #560; tsd-jsdoc progress

Author: dcodeIO

.github/ISSUE_TEMPLATE.md

@@ -3,13 +3,13 @@ protobuf.js version: <fill in>
 ### How to reproduce ###
 
 ```js
-<code snippet>
+<please add a code snippet>
 ```
 
-### Expected behaviour ###
+### Expected behavior ###
 
 <please describe>
 
-### Actual behaviour ###
+### Actual behavior ###
 
 <please describe>

cli/pbts.js

@@ -51,7 +51,7 @@ exports.main = function(args) {
 
     // There is no proper API for jsdoc, so this executes the CLI and pipes the output
     var basedir = path.join(__dirname, "..");
-    var moduleName = argv.name || "mymodule";
+    var moduleName = argv.name || "null";
     var child = child_process.exec("node \"" + basedir + "/node_modules/jsdoc/jsdoc.js\" -c \"" + basedir + "/jsdoc.types.json\" -q \"module=" + encodeURIComponent(moduleName) + "\" " + files.map(function(file) { return '"' + file + '"'; }).join(' '), {
         cwd: process.cwd(),
         argv0: "node",