Added Arch instructions to VPS.md

VPS.md

@@ -14,6 +14,19 @@ The first step is installing some essential dependencies from your VPS's package
 On CentOS after installing Postgres, I needed to run these commands, Fedora likely the same.
 
     service postgresql initdb && service postgresql start
+
+#### Arch Linux
+
+    pacman -S git postgresql base-devel libxml2 libxslt curl sqlite readline postgresql-libs
+
+Here are some Arch specific instructions for setting up postgres
+
+    systemd-tmpfiles --create postgresql.conf
+    chown -c -R postgres:postgres /var/lib/postgres
+    sudo su - postgres -c "initdb --locale en_US.UTF-8 -E UTF8 -D '/var/lib/postgres/data'"
+    systemctl start postgresql
+    systemctl enable postgresql
+
 
 Set up the database
 ===================
@@ -31,8 +44,10 @@ Create your stringer user
 
 We will run stringer as it's own user for security, also we will be installing a specific version of ruby to stringer user's home directory, this saves us worrying whether the version of ruby and some dependencies provided by your distro are compatible with Stringer.
 
-    adduser stringer --shell /bin/bash
-    su stringer
+    useradd stringer -m -s /bin/bash
+    su -l stringer
+
+Always use -l switch when you switch user to your stringer user, without it your modified .bash_profile or .profile file will be ignored. 
 
 Install Ruby for your stringer user
 ===================================