Moved uApprove.xml file to template

uApprove.xml file has been moved to a template file in anticipation of
future editing. A template file allows more versatile variable
substitution.
Modified task to write uApprove.xml from template

instead of copying across a file. Copying across a template allows
greater flexibility in substituting variables.
Merge branch 'feature/broaden-status-access' into feature/file-to-template
Merge pull request #98 from ausaccessfed/feature/file-to-template

Changed uApprove.xml to template file
Resolves #96