add note about using a VM

README.md

@@ -11,18 +11,27 @@ An advanced web framework using the Haskell programming language. Featuring:
     * this is built in to the Haskell programming language (like Erlang)
     * handles a greater concurrent load than any other web application server
 
-## Learn more: http://yesodweb.com/
+# Learn more: http://yesodweb.com/
 
-## Installation: http://www.yesodweb.com/page/quickstart
+## Install the latests stable Yesod: http://www.yesodweb.com/page/quickstart
 
     cabal update && cabal install yesod
 
-## Create a new project after installing
+### Create a new project after installing
 
     yesod init
 
 Your application is a cabal package and you use `cabal` to install its dependencies.
 
+# Installing & isolation
+
+Install conflicts are unfortunately common in Haskell development.
+If you are not using any sandbox tools, you may discover that some of the other haskell installs on your system are broken.
+You can prevent this by using sandbox tools: `cabal-dev` or `virthualenv`, now being renamed to `hsenv`.
+
+Isolating an entire project with a virtual machine is also a great idea, you just need some tools to help that process.
+[Vagrant](http://vagrantup.com) is a great tool for that and there is a [Haskell Platform installer](https://bitbucket.org/puffnfresh/vagrant-haskell-heroku) for it.
+
 ## Using cabal-dev
 
 cabal-dev creates a sandboxed environment for an individual cabal package.
@@ -30,6 +39,8 @@ Instead of using the `cabal` command, use the `cabal-dev` command which will use
 
 Use `yesod-devel --dev` when developing your application.
 
+
+
 ## Installing the latest development version from github for use with your application
 
     cabal update
@@ -49,13 +60,9 @@ Now run: `cabal-meta install`. If you use `cabal-dev`, run `cabal-meta --dev ins
 This should work almost all of the time. You can read more on [cabal-meta](https://github.com/yesodweb/cabal-meta)
 If you aren't building from an application, remove the `./` and create a new directory for your sources.txt first.
 
-Install conflicts are unfortunately common in Haskell development.
-If you are not using any sandbox tools, you may discover that some of the other haskell installs on your system are broken.
-You can prevent this by using sandbox tools. `cabal-dev` was already mentioned.
-Another alternative is `virthualenv`, now being renamed to `hsenv`.
 
 
-### virthualenv
+## virthualenv
 
 We recommend using [virthualenv](http://hackage.haskell.org/package/virthualenv)/[hsenv](https://github.com/Paczesiowa/hsenv) when hacking on Yesod from Linux. This is optional, but prevents your custom build of Yesod from interfering with your currently installed cabal packages.
 
@@ -67,7 +74,7 @@ virthualenv will not work on Windows and maybe not Mac. Use cabal-dev instead
 * cabal-dev can isolate multiple packages together by using the -s sandbox argument
 
 
-### cabal-src
+## cabal-src
 
 The cabal-src tool helps resolve dependency conflicts when installing local packages.
 This capability is already built in if you are using cabal-dev or cabal-meta. Otherwise install cabal-src with:
@@ -78,7 +85,7 @@ Whenever you would use `cabal install` to install a local package, use `cabal-sr
 Our installer script now uses cabal-src-install when it is available.
 
 
-### Cloning the repos
+## Cloning the repos
 
 The above instructions for building the latest should work well.
 But you can clone the repos without the help of cabal-meta:
@@ -93,11 +100,11 @@ for repo in shakespeare persistent wai yesod; do
 done
 ~~~~
 
-### Building your changes to Yesod
+## Building your changes to Yesod
 
 Yesod is composed of 4 "mega-repos", each with multiple cabal packages. `./script/install` will run tests against each package and install each package.
 
-#### install package in all repos
+### install package in all repos
 
 ~~~ { .bash }
 for repo in shakespeare persistent wai yesod; do
@@ -105,18 +112,18 @@ for repo in shakespeare persistent wai yesod; do
 done
 ~~~
 
-#### Clean build (sometimes necessary)
+### Clean build (sometimes necessary)
 
 ~~~ { .bash }
 ./scripts/install --clean
 ~~~
 
-#### Building individual packages
+### Building individual packages
 
+~~~ { .bash }
 # move to the individual package you are working on
 cd shakespeare-text
 
-~~~ { .bash }
 # build and test the individual package
 cabal configure -ftest --enable-tests
 cabal build