Added rake task to start server in a more production-ready manner using Puma; move config values to config directory

config/defaults.yaml

@@ -0,0 +1,10 @@
+stgm:
+  base_directory: '/srv/videos'
+
+server:
+  address: '127.0.0.1'
+  port: 4567
+
+database:
+  adapter: 'sqlite'
+  database: 'data/stgm.db'

config/puma.rb

@@ -0,0 +1,6 @@
+# Load application config
+require './app/config.rb'
+$conf = Config.new(File.join(__dir__, 'config/config.yaml'))
+
+bind_address = "tcp://#{$conf.get('server.address')}:#{$conf.get('server.port')}"
+bind bind_address