Clean up plugin READMEs and a few plugins

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

plugins/chucknorris/README.md

@@ -1,6 +1,6 @@
 # chucknorris
 
-Chuck Norris fortunes plugin for oh-my-zsh
+Chuck Norris fortunes plugin for oh-my-zsh. Perfectly suitable as MOTD.
 
 **Maintainers**: [apjanke](https://github.com/apjanke) [maff](https://github.com/maff)
 
@@ -10,11 +10,31 @@ To use it add `chucknorris` to the plugins array in you zshrc file.
 plugins=(... chucknorris)
 ```
 
-
-Depends on fortune (and cowsay if using chuck_cow) being installed (available via homebrew, apt, ...). Perfectly suitable as MOTD.
-
+## Usage
 
 | Command     | Description                     |
 | ----------- | ------------------------------- |
 | `chuck`     | Print random Chuck Norris quote |
 | `chuck_cow` | Print quote in cowthink         |
+
+Example: output of `chuck_cow`:
+
+```
+Last login: Fri Jan 30 23:12:26 on ttys001
+ ______________________________________
+( When Chuck Norris plays Monopoly, it )
+( affects the actual world economy.    )
+ --------------------------------------
+        o   ^__^
+         o  (oo)\_______
+            (__)\       )\/\
+                ||----w |
+                ||     ||
+```
+
+## Requirements
+
+- `fortune`
+- `cowsay` if using `chuck_cow`
+
+Available via homebrew, apt, ...