Fix disconnect then scan crash (#203)

* Fix crashes when a queueable needs to fail due to a queued disconnection, #196

Failing a queueable requires updating a queue, and therefore requires a reference to the queue. The disconnection queued failure block is relatively new, so I didn't catch the new requirement to shuffle the queue assignment to the new starting point of the add call.

* Bump version to 0.8.4, #196

Bluejay.podspec

@@ -1,12 +1,12 @@
 Pod::Spec.new do |spec|
   spec.name = 'Bluejay'
-  spec.version = '0.8.3'
+  spec.version = '0.8.4'
   spec.license = { type: 'MIT', file: 'LICENSE' }
   spec.homepage = 'https://github.com/steamclock/bluejay'
   spec.authors = { 'Jeremy Chiang' => 'jeremy@steamclock.com' }
   spec.summary = 'Bluejay is a simple Swift framework for building reliable Bluetooth apps.'
   spec.homepage = 'https://github.com/steamclock/bluejay'
-  spec.source = { git: 'https://github.com/steamclock/bluejay.git', tag: 'v0.8.3' }
+  spec.source = { git: 'https://github.com/steamclock/bluejay.git', tag: 'v0.8.4' }
   spec.source_files = 'Bluejay/Bluejay/*.{h,swift}'
   spec.framework = 'SystemConfiguration'
   spec.platform = :ios, '10.0'

Bluejay/.jazzy.yaml

@@ -2,7 +2,7 @@ output: ../docs
 author: Steamclock Software
 author_url: http://steamclock.com
 module: Bluejay
-module_version: 0.8.3
+module_version: 0.8.4
 readme: ../README.md
 sdk: iphone
 copyright: Copyright © 2017 Steamclock Software. All rights reserved.

Bluejay/Bluejay/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.8.3</string>
+	<string>0.8.4</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>NSPrincipalClass</key>

Bluejay/Bluejay/Queue.swift

@@ -55,12 +55,13 @@ class Queue {
             preconditionFailure("Cannot enqueue: Bluejay instance is nil.")
         }
 
+        queueable.queue = self
+
         if isDisconnectionQueued {
             queueable.fail(BluejayError.disconnectQueued)
             return
         }
 
-        queueable.queue = self
         queue.append(queueable)
 
         /*