standardize plugins, update metadata

add about-plugin metadata
chmod -x plugins
cleanup filenames to standardize on x.plugin.bash format
only plugin files intended to be executable from the command line should
contain a shebang line, and should be a+x.

plugins/available/subversion.plugin.bash

@@ -1,8 +1,21 @@
-#!/usr/bin/env bash
+cite about-plugin
+about-plugin 'svn helper functions'
+
 rm_svn(){
+  about 'remove ".svn" files from directory'
+  param '1: directory to search for files'
+  group 'svn'
+
+  if [ -z "$1" ]; then
+      reference rm_svn
+      return
+  fi
   find $1 -name .svn -print0 | xargs -0 rm -rf
 }
 
 svn_add(){
-	svn status | grep '^\?' | sed -e 's/? *//' | sed -e 's/ /\ /g' | xargs svn add
+    about 'add to svn repo'
+    group 'svn'
+
+    svn status | grep '^\?' | sed -e 's/? *//' | sed -e 's/ /\ /g' | xargs svn add
 }