Update the install instructions to include building from coffeescript

I've seen other projects just commit the compiled javascript, so users
don't need to build it first. Feels messy to me, but I'm open to debate.

1 files changed, 7 insertions, 5 deletions

diff --git a/README.markdown b/README.markdown
index 1bab6753..46d87e94 100644
--- a/README.markdown
+++ b/README.markdown
@@ -11,10 +11,12 @@ You can install the stable version of Vimium from the
 
 Alternatively, you can install it from source:
 
-1. Navigate to `chrome://extensions`
-2. Toggle into Developer Mode
-3. Click on "Load Unpacked Extension..."
-4. Select the Vimium directory.
+1. Install [Coffeescript](http://coffeescript.org/#installation) (needed to build vimium).
+2. Run `cake build` in the Vimium directory.
+3. Navigate to `chrome://extensions`
+4. Toggle into Developer Mode
+5. Click on "Load Unpacked Extension..."
+6. Select the Vimium directory.
 
 The Options page can be reached via a link on the help dialog (hit `?`) or via the button next to Vimium on
 the Chrome Extensions page (`chrome://extensions`).
@@ -132,7 +134,7 @@ Vimium is written in Coffeescript, which compiles to Javascript. To build Vimium
 When you're done, send us a pull request on Github. Feel free to include a change to the CREDITS file with
 your patch.
 
-Some brief coding style guidelines: 1) follow the style already present in the file, 2) ensure your lines
+A few coding style guidelines: 1) follow the style already present in the file, 2) ensure your lines
 don't exceed 110 characters.
 
 Release Notes