Run tests with Saxon 9.7.0-15 (#77)

* Use the same environment variable name as .travis.yml
* Put Saxon jar into temp dir as .travis.yml does
* Run tests with Saxon 9.7.0-15

.travis.yml

@@ -1,7 +1,7 @@
 env:
     matrix:
         # latest Saxon 9.7 version
-        - SAXON_VERSION=9.7.0-14
+        - SAXON_VERSION=9.7.0-15
         # latest Saxon 9.6 version
         - SAXON_VERSION=9.6.0-10
         # Saxon version used in oXygen

appveyor.yml

@@ -1,18 +1,20 @@
 environment:
-  SAXON_CP: '%APPVEYOR_BUILD_FOLDER%\saxon\saxon9he.jar'
+  SAXON_CP: '%TEMP%\xspec\saxon\saxon9he.jar'
   matrix:
     # latest Saxon 9.7 version
-    - SAXON_VER: 9.7.0-14
+    - SAXON_VERSION: 9.7.0-15
     # latest Saxon 9.6 version
-    - SAXON_VER: 9.6.0-10
+    - SAXON_VERSION: 9.6.0-10
     # Saxon version used in oXygen
-    - SAXON_VER: 9.6.0-7
+    - SAXON_VERSION: 9.6.0-7
 
 install:
 - ps: >-
-    mkdir -Name "saxon"
+    $saxon_home = Split-Path -Path "${env:SAXON_CP}" -Parent
 
-    Invoke-WebRequest "http://central.maven.org/maven2/net/sf/saxon/Saxon-HE/${env:SAXON_VER}/Saxon-HE-${env:SAXON_VER}.jar" -OutFile "saxon\saxon9he.jar"
+    mkdir -Path $saxon_home
+
+    Invoke-WebRequest -Uri "http://central.maven.org/maven2/net/sf/saxon/Saxon-HE/${env:SAXON_VERSION}/Saxon-HE-${env:SAXON_VERSION}.jar" -OutFile "${env:SAXON_CP}"
 build: off
 test_script:
 - cmd: >-