Remove Deprecation Warnings From Tests

:rotating_light: **WIP** :rotating_light:

This PR will remove all deprecation warnings for the current test suite, e.g.:

> Use Project::open instead
> at Project.openSync (/Applications/Atom.app/Contents/Resources/app/src/project.js:201:7)
> at Workspace.openSync (/Applications/Atom.app/Contents/Resources/app/src/workspace.js:209:29)
> at WorkspaceView.openSync > (/Applications/Atom.app/Contents/Resources/app/node_modules/delegato/lib/delegator.js:67:61)
> at autocomplete-spec.coffee:21:26

Status: **Not Ready For Merge** (I will update this when the work is complete)