Add a plugin to help manage path and manpath

* set path based on contents of a PATHRC file defaulting to .pathrc
    PATHRC file should have one directory per line to set the path
* set manpath based on contents of a MANPATHRC file defaulting to .manpathrc
    MANPATHRC file should have one directory per line to set the manpath

plugins/pathrc/pathrc.plugin.zsh

@@ -0,0 +1,27 @@
+# If there is no PATHRC already set, default to ~/.pathrc
+if [ -z "$PATHRC" ]; then
+    PATHRC=$HOME/.pathrc
+fi
+
+# Similarly, MANPATHRC defaults to ~/.manpath
+if [ -z "$MANPATHRC" ]; then
+    MANPATHRC=$HOME/.manpathrc
+fi
+
+# Set the PATH
+if [ -f $PATHRC ]; then
+    path=()
+    typeset -U path
+    for dir in $(<$PATHRC); do 
+        path+=($dir)
+    done 
+fi 
+
+# Set the MANPATH
+if [ -f $MANPATHRC ]; then
+    manpath=()
+    typeset -U manpath
+    for dir in $(<$MANPATHRC); do
+        manpath+=($dir)
+    done 
+fi