Added add-zsh-hook support to themes

I added add-zsh-hook support to the themes that didn't have it already.
This allows the themes to co-exist with plugins and lib/termsupport.

themes/jonathan.zsh-theme

@@ -1,19 +1,19 @@
-function precmd {
+function theme_precmd {
     local TERMWIDTH
     (( TERMWIDTH = ${COLUMNS} - 1 ))
 
 
     ###
     # Truncate the path if it's too long.
-    
+
     PR_FILLBAR=""
     PR_PWDLEN=""
-    
+
     local promptsize=${#${(%):---(%n@%m:%l)---()--}}
     local rubyprompt=`rvm_prompt_info`
     local rubypromptsize=${#${rubyprompt}}
     local pwdsize=${#${(%):-%~}}
-    
+
     if [[ "$promptsize + $rubypromptsize + $pwdsize" -gt $TERMWIDTH ]]; then
       ((PR_PWDLEN=$TERMWIDTH - $promptsize))
     else
@@ -24,7 +24,7 @@ function precmd {
 
 
 setopt extended_glob
-preexec () {
+theme_preexec () {
     if [[ "$TERM" == "screen" ]]; then
 	local CMD=${1[(wr)^(*=*|sudo|-*)]}
 	echo -n "\ek$CMD\e\\"
@@ -69,7 +69,7 @@ setprompt () {
 
     ###
     # See if we can use extended characters to look nicer.
-    
+
     typeset -A altchar
     set -A altchar ${(s..)terminfo[acsc]}
     PR_SET_CHARSET="%{$terminfo[enacs]%}"
@@ -81,10 +81,10 @@ setprompt () {
     PR_LRCORNER=${altchar[j]:--}
     PR_URCORNER=${altchar[k]:--}
 
-    
+
     ###
     # Decide if we need to set titlebar text.
-    
+
     case $TERM in
 	xterm*)
 	    PR_TITLEBAR=$'%{\e]0;%(!.-=*[ROOT]*=- | .)%n@%m:%~ | ${COLUMNS}x${LINES} | %y\a%}'
@@ -96,8 +96,8 @@ setprompt () {
 	    PR_TITLEBAR=''
 	    ;;
     esac
-    
-    
+
+
     ###
     # Decide whether to set a screen title
     if [[ "$TERM" == "screen" ]]; then
@@ -105,8 +105,8 @@ setprompt () {
     else
 	PR_STITLE=''
     fi
-    
-    
+
+
     ###
     # Finally, the prompt.
 
@@ -135,3 +135,7 @@ $PR_CYAN$PR_SHIFT_IN$PR_HBAR$PR_SHIFT_OUT$PR_NO_COLOUR '
 }
 
 setprompt
+
+autoload -U add-zsh-hook
+add-zsh-hook precmd  theme_precmd
+add-zsh-hook preexec theme_preexec