Merge pull request #12 from g-Off/fix-version-parsing

adds Version library to fix parsing of `-alpha.1` type versions

Author: g-Off

Package.swift

@@ -13,12 +13,13 @@ let package = Package(
             targets: ["XcodeProject"]),
     ],
     dependencies: [
-		.package(url: "https://github.com/g-Off/ObjectCoder.git", .exact("0.1.0"))
+		.package(url: "https://github.com/g-Off/ObjectCoder.git", .exact("0.1.0")),
+		.package(url: "https://github.com/mxcl/Version.git", from: "1.0.0")
     ],
     targets: [
         .target(
             name: "XcodeProject",
-            dependencies: ["ObjectCoder"]),
+            dependencies: ["ObjectCoder", "Version"]),
         .testTarget(
             name: "XcodeProjectTests",
             dependencies: ["XcodeProject"]),

Sources/XcodeProject/Objects+Extensions/PBXReference+Extensions.swift

@@ -36,7 +36,11 @@ public extension PBXReference {
 		return nil
 	}
 
-	enum SortOption: String {
+	enum SortOption: String, CustomStringConvertible, CaseIterable {
+		public var description: String {
+			return rawValue
+		}
+		
 		case name
 		case type
 

Sources/XcodeProject/Objects/Swift Package/XCRemoteSwiftPackageReference.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import Version
 
 public final class XCRemoteSwiftPackageReference: XCSwiftPackageReference {
 	public enum Requirement: Encodable {
@@ -17,33 +18,6 @@ public final class XCRemoteSwiftPackageReference: XCSwiftPackageReference {
 			case branch
 			case revision
 		}
-
-		public struct Version: CustomStringConvertible, Encodable {
-			let major: Int
-			let minor: Int
-			let patch: Int
-
-			public init(major: Int, minor: Int, patch: Int) {
-				self.major = major
-				self.minor = minor
-				self.patch = patch
-			}
-			
-			init?(_ value: String) {
-				var integerValues = value.components(separatedBy: ".").compactMap { Int($0) }
-				guard integerValues.count == 3 else { return nil }
-				self.init(major: integerValues.removeFirst(), minor: integerValues.removeFirst(), patch: integerValues.removeFirst())
-			}
-			
-			public var description: String {
-				return "\(major).\(minor).\(patch)"
-			}
-			
-			public func encode(to encoder: Encoder) throws {
-				var container = encoder.singleValueContainer()
-				try container.encode(description)
-			}
-		}
 
 		public struct GitHash: Encodable, CustomStringConvertible {
 			private var value: String