Updated ASP.NET dependencies and mono

Updated `aspnet` dependencies. There is no need for a custom build of Npgsql because my [pull request](https://github.com/franciscojunior/Npgsql2/pull/19) was accepted!

I also upgraded mono to 3.2.1. I didn't test it properly so please do not merge it in just yet.

I was also playing with [`<applicationPool>`](http://msdn.microsoft.com/en-us/library/dd560842.aspx) but it didn't seem to improve anything much.