Use case insensitive glob matching, to pick up images/etc with uppercase extensions (#1176)

Author: cjpete

lib/utils/post-build.js

@@ -59,7 +59,7 @@ module.exports = (program, cb) => {
     const assetTypes =
       '*.jpg|*.jpeg|*.png|*.pdf|*.gif|*.ico|*.svg|*.pdf|*.txt|*.zip|CNAME'
     const globString = `${directory}/pages/**/?(${assetTypes})`
-    return glob(globString, { follow: true }, (e, files) =>
+    return glob(globString, { follow: true, nocase: true }, (e, files) =>
       async.map(
         files,
         copy,