no more complex cloning

Author: hannes

appveyor.yml

@@ -7,12 +7,6 @@ init:
         Invoke-WebRequest http://raw.github.com/krlmlr/r-appveyor/master/scripts/appveyor-tool.ps1 -OutFile "..\appveyor-tool.ps1"
         Import-Module '..\appveyor-tool.ps1'
 
-clone_script:
-  - git clone --depth 10 -q --branch=%APPVEYOR_REPO_BRANCH% https://github.com/%APPVEYOR_REPO_NAME%.git %APPVEYOR_BUILD_FOLDER%
-  - cd %APPVEYOR_BUILD_FOLDER%
-  - git checkout -qf %APPVEYOR_REPO_COMMIT%
-  - git submodule update --init --recursive --depth 1
-
 install:
   - ps: Bootstrap