Update for docker-machine version 0.5.

Fix machine state parsing.
Give NFS mount verification multiple delayed attempts.
Add support for parallels driver.
Generalise property names.
Refactor variable names.
Format code to fit into 80 column space.

Author: blueimp

README.md

@@ -1,13 +1,20 @@
 # Docker Machine NFS
 
-Activates NFS for an existing boot2docker box created through Docker Machine. 
+Activates [NFS](https://en.wikipedia.org/wiki/Network_File_System) for an
+existing boot2docker box created through
+[Docker Machine](https://docs.docker.com/machine/).
+
+## Requirements
+
+* Mac OS X 10.9+
+* [Docker Machine](https://docs.docker.com/machine/) 0.5.0+
 
 ## Install
 
 ```sh
-# Mac OS X
-sudo curl -o /usr/local/bin/docker-machine-nfs https://raw.githubusercontent.com/adlogix/docker-machine-nfs/master/docker-machine-nfs.sh && \
-sudo chmod +x /usr/local/bin/docker-machine-nfs 
+curl https://raw.githubusercontent.com/adlogix/docker-machine-nfs/master/docker-machine-nfs.sh |
+  sudo tee /usr/local/bin/docker-machine-nfs > /dev/null && \
+  sudo chmod +x /usr/local/bin/docker-machine-nfs
 ```
 
 ## Usage
@@ -22,4 +29,5 @@ docker-machine-nfs <machine-name> [--force]
 
 ## Credits
 
-Heavily inspired by @[mattes](https://github.com/mattes) ruby version (https://gist.github.com/mattes/4d7f435d759ca2581347)
+Heavily inspired by @[mattes](https://github.com/mattes) ruby version
+[boot2docker-nfs.rb](https://gist.github.com/mattes/4d7f435d759ca2581347).