Add `git fetch` to deploy script.

+ Add `git fetch` to deploy script to prevent issues with local branch
  being ahead of remote branch (actually we don't know if this is an
  issue, but git complains, and this is how we stop it complaining...)
+ Remove some extraneous whitespace.
Merge pull request #44 from leftclickben/AddGitFetchToDeploy

Add `git fetch` to deploy script.
Strip terms from minerals import taxonomies
* chemical_elements
* host_rock_types
* minerals