Clean up plugin READMEs and a few plugins

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

plugins/dirhistory/README.md

@@ -7,6 +7,7 @@ To use it, add `dirhistory` to the plugins array in your zshrc file:
 ```zsh
 plugins=(... dirhistory)
 ```
+
 ## Keyboard Shortcuts
 
 | Shortcut                          | Description                                               |
@@ -15,3 +16,24 @@ plugins=(... dirhistory)
 | <kbd>alt</kbd> + <kbd>right</kbd> | Undo <kbd>alt</kbd> + <kbd>left</kbd>                     |
 | <kbd>alt</kbd> + <kbd>up</kbd>    | Move into the parent directory                            |
 | <kbd>alt</kbd> + <kbd>down</kbd>  | Move into the first child directory by alphabetical order |
+
+## Usage
+
+This plugin allows you to navigate the history of previous current-working-directories using ALT-LEFT and ALT-RIGHT. ALT-LEFT moves back to directories that the user has changed to in the past, and ALT-RIGHT undoes ALT-LEFT. MAC users may alternately use OPT-LEFT and OPT-RIGHT.
+
+Also, navigate directory **hierarchy** using ALT-UP and ALT-DOWN. (mac keybindings not yet implemented). ALT-UP moves to higher hierarchy (shortcut for 'cd ..'). ALT-DOWN moves into the first directory found in alphabetical order (useful to navigate long empty directories e.g. java packages)
+
+For example, if the shell was started, and the following commands were entered:
+
+```shell
+cd ~
+cd /usr
+cd share
+cd doc
+```
+
+Then entering ALT-LEFT at the prompt would change directory from /usr/share/doc to /usr/share, then if pressed again to /usr/, then ~. If ALT-RIGHT were pressed the directory would be changed to /usr/ again.
+
+After that, ALT-DOWN will probably go to /usr/bin (depends on your /usr structure), ALT-UP will return to /usr, then ALT-UP will get you to /
+
+**Currently the max history size is 30**. The navigation should work for xterm, PuTTY xterm mode, GNU screen, and on MAC with alternate keys as mentioned above.