Add package-lock.json file

Also update .gitattribtues to configure npm files to use LF since the newer version seems insistent about using LF.    See npm/npm#17161

Author: rkeithhill

.gitattributes

@@ -1,2 +1,7 @@
 # Set the default behavior, in case people don't have core.autocrlf set.
 * text=auto
+
+# .gitattributes in project root
+# npm now seems to be insisting on LF - see https://github.com/npm/npm/issues/17161
+package.json      text eol=lf
+package-lock.json text eol=lf