added unset & flushdns commands

Signed-off-by: Daniel Sieradski <[email protected]>

README.md

@@ -16,14 +16,16 @@ Inspired by the [oh-my-zsh][original-plugin]’s plugin of same name by
 functions:
 
 - `cdf` - `cd` to the current Finder directory
-- `itunes` - Controle iTunes. Play, pause, stop, resume, etc.
+- `flushdns` - Flushes the DNS cache for Yosemite and El Capitan
+- `itunes` - Control iTunes: Play, pause, stop, resume, etc.
 - `manp` - Open a specified man page in Preview
 - `pfd` - Return the path of the frontmost Finder window
 - `pfs` - Return the current Finder selection
 - `pushdf` - `pushd` to the current Finder directory
 - `ql` - Quick Look a specified file or directory
 - `showhidden` - Shows hidden files and folders in Finder
 - `trash` - Move a specified file to the Trash
+- `unset` - Emulates the `unset` command to unset an environment variable
 - `updatedb` - Updates locate command database
 
 > *Note*: the `tab` function was dropped in favor a more robust [plugin-tab].

flushdns.fish

@@ -0,0 +1,3 @@
+function flushdns -d "Flushes OS X DNS cache"
+  sudo killall -HUP mDNSResponder
+end

unset.fish

@@ -0,0 +1,3 @@
+function unset
+  set --erase $argv
+end