Setup bors and CI

appveyor.yml

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+skip_branch_with_pr: true
+branches:
+  except:
+    - staging.tmp
+environment:
+  global:
+    PATH: '%PATH%;C:\msys64\mingw64\bin;C:\msys64\usr\bin;%USERPROFILE%\.cargo\bin'
+    RUST_BACKTRACE: full
+  matrix:
+  - CHANNEL: stable
+    TARGET: x86_64-pc-windows-msvc
+
+skip_commits:
+  files:
+    - bors.toml
+    - '*.md'
+
+install:
+  - curl -sSf -o rustup-init.exe https://win.rustup.rs
+  - rustup-init -yv --default-toolchain %CHANNEL% --default-host %TARGET%
+  - rustc -vV
+  - cargo -vV
+
+build: false
+test_script:
+  - C:\MinGW\bin\mingw32-make.exe all

bors.toml

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+status = [
+  "continuous-integration/appveyor/branch"
+]
+
+timeout_sec = 18000 # 5 hours