update plugin management

plugins/available/hg.plugin.bash

@@ -1,9 +1,9 @@
 cite about-plugin
-about-plugin hg helper functions
+about-plugin 'hg helper functions'
 
 hg_dirty() {
-    about displays dirty status of hg repository
-    group hg
+    about 'displays dirty status of hg repository'
+    group 'hg'
 
     hg status --no-color 2> /dev/null \
     | awk '$1 == "?" { print "?" } $1 != "?" { print "!" }' \
@@ -12,14 +12,14 @@ hg_dirty() {
 
 hg_in_repo() {
     about 'determine if pwd is an hg repo'
-    group hg
+    group 'hg'
 
     [[ `hg branch 2> /dev/null` ]] && echo 'on '
 }
 
 hg_branch() {
-    about display current hg branch
-    group hg
+    about 'display current hg branch'
+    group 'hg'
 
     hg branch 2> /dev/null
 }