Summary:
Queries xcode-select on ios dispatcher startup, to see if it's installed.
If it is, carry on with the ios device tracking, if not, don't bother.
This should stop it from emitting errors trying to track devices when things aren't installed.
I think it should also stop those install prompts from popping up.
Sets it in app state so we can tell the user about it, and maybe gate some other things too.
Reviewed By: passy
Differential Revision: D17830696
fbshipit-source-id: 960d09a9c5267afabf5e5e222379a0a7ed2cc444
Summary: A settings screen has been added where android home can be set. This changes the downstream code to use this value rather than the `env.PATH` variable.
Reviewed By: passy
Differential Revision: D17713288
fbshipit-source-id: 51551652c9c2f468e1117c18785123348e4b4576
