Update to 6/29 snapshot

.gitignore

@@ -38,6 +38,7 @@ playground.xcworkspace
 # Packages/
 .build/
 Packages/
+Package.resolved
 
 # CocoaPods
 #

.travis.yml

@@ -17,22 +17,21 @@ matrix:
     - os: linux
       dist: trusty
       sudo: required
-      env: SWIFT_VERSION=3.0.2
+      env: SWIFT_SNAPSHOT=3.0.2
     - os: linux
       dist: trusty
       sudo: required
-      env: SWIFT_VERSION=4.0-DEVELOPMENT-SNAPSHOT-2017-06-11-a
+      env: SWIFT_SNAPSHOT=4.0-DEVELOPMENT-SNAPSHOT-2017-06-29-a
     - os: osx
       osx_image: xcode8.3
       sudo: required
     - os: osx
-      osx_image: xcode8.3
+      osx_image: xcode9
       sudo: required
-      env: SWIFT_VERSION=4.0-DEVELOPMENT-SNAPSHOT-2017-06-11-a
+      env: SWIFT_SNAPSHOT=4.0-DEVELOPMENT-SNAPSHOT-2017-06-29-a
 
 before_install:
     - git clone https://github.com/IBM-Swift/Package-Builder.git
-    - test -n "$SWIFT_VERSION" && echo "$SWIFT_VERSION" > .swift-version || echo "SWIFT_VERSION not set, using $(cat .swift-version)"
 
 script:
   - ./Package-Builder/build-package.sh -projectDir $TRAVIS_BUILD_DIR

Tests/ConfigurationTests/ConfigurationManagerTest.swift

@@ -204,13 +204,18 @@ class ConfigurationManagerTest: XCTestCase {
             // ran from .build directory on Linux
         #else
             // Force rebuild of test executable on OSX
-            (errPipe, outPipe, exitCode) = shell("swift", "build", "-C", projectFolder.path)
+
+            // Need to pass in current environment variables on local machine or it will fail with
+            // `error: Unable to find executable for 'xcrun'`
+            // when ran with Xcode 9 beta
+            (errPipe, outPipe, exitCode) = shell("swift", "build", "-C", projectFolder.path, environment: ProcessInfo.processInfo.environment)
             output = String(data: outPipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8)
 
             print(output ?? "No stdout from `swift build -C \(projectFolder.path)`")
 
             guard exitCode == 0 else {
-                XCTFail("Unable to build project")
+                let error = String(data: errPipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8)
+                XCTFail(error ?? "No stderr from `swift build -C \(projectFolder.path)`")
                 return
             }
         #endif