Better/faster exporting

* add --build and --build-dir options to sapper export (#325)

* tweak export logging, update port-authority to prevent timeout bug

* better logging of export progress

* handle case where linked resource is already fetched

* default to .sapper/dev instead of .sapper

* handle query params and redirects

* dont write server_info.json either - second half of #318

* update changelog

* update lockfile

* try to track down ci test failures

* err wut

* curiouser and curiouser

* ok, seems to work now

CHANGELOG.md

@@ -1,5 +1,11 @@
 # sapper changelog
 
+## 0.15.5
+
+* Faster `export` with more explanatory output ([#335](https://github.com/sveltejs/sapper/pull/335))
+* Only blur `activeElement` if it exists ([#332](https://github.com/sveltejs/sapper/issues/332))
+* Don't emit `client_info.json` or `server_info.json` ([#318](https://github.com/sveltejs/sapper/issues/318))
+
 ## 0.15.4
 
 * Add `ignore` option ([#326](https://github.com/sveltejs/sapper/pull/326))