Updates polymorphic relation example

I believe this was meant to be morphMany not hasMany.
added example of attaching view composer to multiple views at once
Adding docs for DB::statement()
Add documentation for date validation rules
Applying callback to the objects in a collection

I love this and I think this should be in the documentation too.
Update events.md
Update installation.md

Added a note that the install process requires Git on the server to successfully complete.
Merge pull request #98 from eoconnell/patch-3

Updates polymorphic relation example
Merge pull request #127 from mikhaill/patch-1

Update installation.md
Merge pull request #116 from raftalks/patch-2

Applying callback to the objects in a collection
Merge pull request #110 from akuzemchak/sql-statements

Adding docs for DB::statement()
Merge pull request #101 from xsbeats/view_composer_array

added example of attaching view composer to multiple views at once
Merge pull request #109 from alexwhitman/date-validation-rules

Add documentation for date validation rules
fixed typo - using sections on blade layout
update the events docs.
update the seeding docs.
update mutator docs.
Updated docs/routing.md to fix the Optional Routing Parameters example

Is this the proper place to contribute revisions to Laravel 4's beta docs? (The laravel/framework repo doesn't contain any docs for me to edit.)

This is a minor fix to get one example working. 

For a route with an optional parameter, all three of the following URLs should work (url, url/, url/param). But with the current example: user and user/ both return an error ("whoops, missing argument 1 for {closure}()"). For this optional routing parameter example to work for all three urls (url, url/, and url/param), it seems the parameter needs to default to null, to prevent errors when the optional parameter is not used.

	// An example
	Route::get('user/{name?}', function($name = null)
	{
	    return 'This string is always shown. But the name is optional: '.$name;
	});

This will work without an error for: user, user/ and user/john
Updated example of View Composer : Correction

The current example throws an exception as it is no longer an event object and right now the callback is given the view object.
added queue docs.