Travis: Add Travis setup

Build for Linux 4.0.3/4.1.0 and Xcode 9.0/9.3.

Author: helje5

.travis.d/before-install.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+if [[ "$TRAVIS_OS_NAME" == "Linux" ]]; then
+    sudo apt-get -q update
+    sudo apt-get install -y wget \
+       clang-3.8 libc6-dev make git libicu52 libicu-dev \
+       git autoconf libtool pkg-config \
+       libblocksruntime-dev \
+       libkqueue-dev \
+       libpthread-workqueue-dev \
+       systemtap-sdt-dev \
+       libbsd-dev libbsd0 libbsd0-dbg \
+       curl libcurl4-openssl-dev \
+       libssl-dev \
+       libedit-dev \
+       libpython2.7 \
+       python2.7 python2.7-dev \
+       libxml2
+
+    sudo update-alternatives --quiet --install /usr/bin/clang clang /usr/bin/clang-3.8 100
+    sudo update-alternatives --quiet --install /usr/bin/clang++ clang++ /usr/bin/clang++-3.8 100
+fi

.travis.d/install.sh

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+#!/bin/bash
+
+# Install Swift
+
+wget "${SWIFT_SNAPSHOT_NAME}"
+
+TARBALL="`ls swift-*.tar.gz`"
+echo "Tarball: $TARBALL"
+
+TARPATH="$PWD/$TARBALL"
+
+cd $HOME # expand Swift tarball in $HOME
+tar zx --strip 1 --file=$TARPATH
+pwd
+
+export PATH="$PWD/usr/bin:$PATH"
+which swift
+
+if [ `which swift` ]; then
+    echo "Installed Swift: `which swift`"
+else
+    echo "Failed to install Swift?"
+    exit 42
+fi
+swift --version
+
+
+# Environment
+
+TT_SWIFT_BINARY=`which swift`
+
+echo "${TT_SWIFT_BINARY}"

.travis.yml

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+language:  generic
+
+notifications:
+    slack: nozeio:LIFY1Jtkx0FRcLq3u1WliHRZ
+
+matrix:
+    include:
+        - os:   Linux
+          dist: trusty
+          env:  SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-4.0.3-release/ubuntu1404/swift-4.0.3-RELEASE/swift-4.0.3-RELEASE-ubuntu14.04.tar.gz"
+          sudo: required
+        - os:   Linux
+          dist: trusty
+          env:  SWIFT_SNAPSHOT_NAME="https://swift.org/builds/swift-4.1-release/ubuntu1404/swift-4.1-RELEASE/swift-4.1-RELEASE-ubuntu14.04.tar.gz"
+          sudo: required
+        - os:   osx
+          osx_image: xcode9
+        - os:   osx
+          osx_image: xcode9.3
+
+
+before_install:
+    - ./.travis.d/before-install.sh
+
+install:
+    - ./.travis.d/install.sh
+
+script:
+    - export PATH="$HOME/usr/bin:$PATH"
+    - export SWIFTENV_ROOT="$HOME/.swiftenv"
+    - export PATH="${SWIFTENV_ROOT}/bin:${SWIFTENV_ROOT}/shims:$PATH"
+    - swift build -c release
+    - swift build -c debug
+