Merge pull request #979 from Alamofire/kylef/spm

Add support for Swift Package Manager (SPM)

.gitignore

@@ -19,5 +19,8 @@ DerivedData
 *.ipa
 *.xcuserstate
 
+# SPM
+.build/
+
 # Carthage
 Carthage/Build

Package.swift

@@ -0,0 +1,6 @@
+import PackageDescription
+
+
+let package = Package(
+  name: "Alamofire"
+)