Add ArcGISToolkit and Alamofire as dependencies

[philium]

This makes sure they get built before the data-collection target is built.

[esreli]

We have a staged change contained by v.next-1.3 that removes Alamofire altogether (and the concept of a network reachability manager more generally). If you're curious, you can see the full PR.

Will this change introduce a merge conflict when, down the line, we rebase v.next-1.3 on top of work performed in this branch? I suppose that wouldn't be too big of a deal, though I wonder if this PR would more easily integrate as an enhancement to v.next-1.3.

[philium]

I did a test merge and yes, the changes would introduce merge conflicts, but they look straightforward to resolve. I could help resolve them if you'd like.

[esreli]

#262 (comment)
@mhdostal, i'll let you make the call since you're likely who will be doing the conflict resolution work here. Otherwise this LGTM.

[philium]

@mhdostal What do you think?

[mhdostal]

We can handle the merge for v1.3 closer to that release. It's good to get this in at v1.2.3.

[philium]

Thank you @mhdostal and @esreli!