Added the installer plugin

This plugin creates 2 aliases "in and up" that are system
and distro agnostic.   For example,
on Mac in = brew install
on SUSE in = sudo -E zypper install
on Debian in = sudo -E apt-get install
on RedHat in = sudo -E yum install

add the 'installer' to your plugin list in ~/.zshrc
source ~/.zshrc

now you can run
'in wget'
'up curl'

plugins/installer/installer.plugin.zsh

@@ -0,0 +1,31 @@
+#!/bin/zsh
+#
+# System agnostic installer aliasing
+#
+# Assumes if you are on a mac, brew is used
+# Suse = zypper
+# ubuntu/debian = apt
+# Redhat = yum
+#
+
+source "${0:h}/core.sh"
+
+case $OS in
+    'mac') 
+        alias in='brew install'
+        alias up='brew upgrade'
+        ;;
+    'linux')
+        if [[ "$DIST" == "ubuntu" ]]; then
+            alias in="sudo -E apt-get install"
+            alias up="sudo -E apt-get upgrade"
+        elif [[ "$DIST" == "suse" ]]; then
+            alias in="sudo -E zypper in"
+            alias up="sudo -E zypper up"
+        elif [[ "$DIST" == "redhat" ]]; then
+            alias in="sudo -E yum install"
+            alias up="sudo -E yup upgrade"
+        fi
+        ;;
+    *) ;;
+esac