Add yank module and update script

modules/yank/init.zsh

@@ -0,0 +1,25 @@
+#
+# Defines yank aliases.
+#
+# Authors:
+#   Daniel Carrillo
+#
+
+# Return if requirements are not found.
+if (( ! $+commands[yank] )); then
+  return 1
+fi
+
+#
+# Aliases
+#
+
+alias yenv="env | yank -d ="     # yank environment variables
+
+#
+# Piping aliases
+#
+
+alias yl="yank -l"               # yank a whole line from command output
+alias yle="yank -l -- sh"        # yank a whole line from command output and
+                                 # exec the line as a command