setting up travis compilation

.travis.yml

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+matrix:
+  include:
+  - os: osx
+    osx_image: xcode9.3beta
+    env:
+    - MATRIX_EVAL=""
+
+before_install:
+  - eval "${MATRIX_EVAL}"
+  - brew update
+  - brew bundle
+
+install:
+  - python3 setup.py install
+script:
+  - python3 -c 'import klayout.db as db; dir(db)'
+  - python3 -c 'import klayout.rdb as rdb; dir(rdb)'
+  - python3 -c 'import klayout.tl as tl; dir(tl)'

Brewfile

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+tap "homebrew/core"
+brew "python3"
+brew "curl"
+brew "expat"