[O] Make ob-shell conform to the org-babel interface

[Bjarte Johansen]

Hi,

I found that ob-shell’s org-babel-variable-assignments:bash function does not 
respect the interface for org-babel. It takes multiple arguments when it should 
only take 1. This is a problem when f.ex. org-babel-sha1-hash tries to expand 
the body of a bash source block and tries to call that function with only 1 
argument.

I am not sure if the following patch follows best practices in the project, but 
it solves the problem for me.

0001-ob-shell-Conform-to-variable-assignment-interface.patch
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