Added scpectrum script for easy 256 color theaming

lib/spectrum.zsh

+#! /bin/zsh
+# A script to make using 256 colors in zsh less painful.
+# P.C. Shyamshankar <sykora@lucentbeing.com>
+# Copied from http://github.com/sykora/etc/blob/master/zsh/functions/spectrum/
+
+typeset -Ag FX FG BG
+
+FX=(
+    reset     ""
+    bold      "" no-bold      ""
+    italic    "" no-italic    ""
+    underline "" no-underline ""
+    blink     "" no-blink     ""
+    reverse   "" no-reverse   ""
+)
+
+for color in {000..255}; do
+    FG[$color]="[38;5;${color}m"
+    BG[$color]="[48;5;${color}m"
+done