Sorting of projects in the download page should be alphabetical

[carolyncaron]

We've received feedback that the way projects are currently sorted in the dropdown appears "random" and is not intuitive. Reynold already addressed this in PR #65 but it might be buggy - instead of trying to fix it we think we should opt for the classic alphabetical sort as it looks to be the most intuitive option.

Currently (before PR #65) the default is set to "All Projects". PR #65 now sets the default to the project that has data uploaded most recently. We want to change this to "Select a Project" to force the user to choose when there are 2 or more. Otherwise, if there is only a single project it will be selected by default. :-)