mark array extension methods join and when as public (#16)

* mark array extension methods join and when as public

* 3.0.7

Author: mvyrko

BAPromise.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
 s.name             = "BAPromise"
-s.version          = "3.0.6"
+s.version          = "3.0.7"
 s.summary          = "Objective C Promise Library"
 s.description      = <<-DESC
     Swift Promise Library. An alternative to NSOperation for asynchronous operations.

Classes/Promise.swift

@@ -275,7 +275,7 @@ extension Promise {
 
 // Join
 extension Array {
-    func when<ValueType>() -> Promise<Array<ValueType>> where Element == Promise<ValueType> {
+    public func when<ValueType>() -> Promise<Array<ValueType>> where Element == Promise<ValueType> {
         guard self.count > 0 else { return Promise<Array<ValueType>>([]) }
         var cancelTokens = [PromiseCancelToken]()
 
@@ -309,7 +309,7 @@ extension Array {
         return returnedPromise
     }
 
-    func join <ValueType>() -> Promise<Array<PromiseResult<ValueType>>> where Element == Promise<ValueType>  {
+    public func join <ValueType>() -> Promise<Array<PromiseResult<ValueType>>> where Element == Promise<ValueType>  {
         guard self.count > 0 else { return Promise<Array<PromiseResult<ValueType>>>([]) }
         var cancelTokens = [PromiseCancelToken]()