fixes to get running locally

as of writing, these commands were needed to unbork postgres/ecto:

sudo -u postgres psql -c "ALTER USER postgres PASSWORD 'postgres';"
sudo /etc/init.d/postgresql restart

see elixir-ecto/ecto#1207 jjahraus's 9 Nov 2016 comment

go.py

@@ -1,8 +1,11 @@
 #!/usr/bin/env python
 
-def invoke(invocation):
-	import subprocess
+def invoke(invocation, path='.'):
+	import os, subprocess
+	start=os.getcwd()
+	os.chdir(path)
 	subprocess.check_call(invocation, shell=True)
+	os.chdir(start)
 
 import argparse
 parser=argparse.ArgumentParser()
@@ -13,6 +16,7 @@ def invoke(invocation):
 if args.build:
 	invoke('mix deps.get')
 	invoke('mix deps.compile')
+	invoke('npm install', 'assets')
 
 if args.run:
 	invoke('mix phx.server')