Added install script to make an initial test easier

There is still room for alot of improvements to this, but using this should allow developers to quite easily test out nosh using either

curl -L https://github.com/WKLive/nosh/raw/master/install.sh | sh

or

wget --no-check-certificate https://github.com/WKLive/nosh/raw/master/install.sh -O - | sh

which also means we will lose the dependency for curl.