Clean up plugin READMEs and a few plugins

- fasd
- history
- mercurial
- pylint
- repo
- yii2

plugins/fasd/fasd.plugin.zsh

@@ -1,13 +1,16 @@
-if [ $commands[fasd] ]; then # check if fasd is installed
-  fasd_cache="${ZSH_CACHE_DIR}/fasd-init-cache"
-  if [ "$(command -v fasd)" -nt "$fasd_cache" -o ! -s "$fasd_cache" ]; then
-    fasd --init posix-alias zsh-hook zsh-ccomp zsh-ccomp-install \
-      zsh-wcomp zsh-wcomp-install >| "$fasd_cache"
-  fi
-  source "$fasd_cache"
-  unset fasd_cache
-
-  alias v='f -e "$EDITOR"'
-  alias o='a -e xdg-open'
-  alias j='zz'
+# check if fasd is installed
+if (( ! ${+commands[fasd]} )); then
+  return
 fi
+
+fasd_cache="${ZSH_CACHE_DIR}/fasd-init-cache"
+if [[ "$commands[fasd]" -nt "$fasd_cache" || ! -s "$fasd_cache" ]]; then
+  fasd --init posix-alias zsh-hook zsh-ccomp zsh-ccomp-install \
+    zsh-wcomp zsh-wcomp-install >| "$fasd_cache"
+fi
+source "$fasd_cache"
+unset fasd_cache
+
+alias v='f -e "$EDITOR"'
+alias o='a -e xdg-open'
+alias j='zz'