add plugin:percol (#4582)

* add plugin:percol

* fix format

* check percol

* fix empty history in gnome terminal

plugins/percol/README.md

@@ -0,0 +1,23 @@
+## percol
+
+Provides some useful function to make [percol](https://github.com/mooz/percol) work with zsh history and [jump plugin](https://github.com/robbyrussell/oh-my-zsh/blob/master/plugins/jump/jump.plugin.zsh)
+
+### Preview
+![Preview](http://t1.qpic.cn/mblogpic/eb1c8f9d2b9f62d19fa8/2000.jpg)
+
+### Requirements
+
+```shell
+pip install percol
+```
+
+And [jump](https://github.com/robbyrussell/oh-my-zsh/blob/master/plugins/jump/jump.plugin.zsh) for `oh-my-zsh` is a optional requirement.
+
+### Usage
+
+For default
+
+- `^-r` bind to `percol_select_history`.You can use it to grep your history with percol.
+
+- `^-b` bind to `percol_select_marks`.You can use it to grep your bookmarks with percol.
+