CI Fix

[ashfurrow]

Two parts:

• Specifies CocoaPods version (should've been doing this anyway)
• Fix for Can't compile because "Nimble/Nimble-Swift.h" can't be found Quick/Nimble#280

[orta]

The optimal 1.0 podfile for this is:

use_frameworks!

target 'RxOptional Examples' do
  pod 'RxOptional', :path => '../'
  pod 'RxSwift', '~> 2.0'
  pod 'RxCocoa', '~> 2.0'

  target 'RxOptional Tests' do
    inherit! :search_paths
    pod 'Quick'
    pod 'Nimble', :git => 'https://github.com/ashfurrow/Nimble.git', :branch => 'podspec-update'
  end
end

[ashfurrow]

Mmm good point.

[orta]

That's a niggle, good to merge regardless of that 👍

[ashfurrow]

Nah, I noticed Podfile.lock was missing, might as well add that here too. Might prevent future CI breaks.

[ashfurrow]

Hmm, now it's red.

[ashfurrow]

Reproduced locally, looks like it's iPhone 4S-only, maybe a 32-bit problem.

[orta]

potentially useful aside: cache: cocoapods is happening on travis too

[ashfurrow]

I'm not really up for dealing with weird CI-only failures, I've merged in 665b1a2 (the last green commit in this PR) and a subsequent addition of Podfile.lock (went green on CI).