Feature/assembly signing

This branch includes a lot of work on the build script

* signing now happens from inside visual studio with a key in `build/keys/keypair.snk` if this file is not there there are prebuild events in place to generate them same goes for running `build` from the command line. The [F5 manifesto still holds](http://www.khalidabuhakmeh.com/the-f5-manifesto-for-net-developers)
* patching the generated NEST.xml to totally hack `<inheritdoc />` support so that I do not have to write xml docs twice or keep them in sync.
* Installing `Elasticsearch.Net` nuget package opens the nest documentation (will point to a breaking changes/getting started page soon)
* Found out the internal web browser still runs IE8, shiv'ed the docs.
* Documentation also rebuild when doing a full release build. 
* Assembly and nuspec version patching.