Add travis ci

.travis.yml

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+# Request an environment that provides sudo (that goes with larger containers)
+# and a minimal language environment.
+sudo: true
+language: minimal
+
+cache: cargo
+
+branches:
+  only:
+  - master
+
+env:
+  global:
+    - RUST_BACKTRACE=1
+  matrix:
+    - RUST_TOOLCHAIN=nightly TARGET=wasm
+    - RUST_TOOLCHAIN=stable TARGET=native
+
+before_install:
+  # Check how much space we've got on this machine.
+  - df -h
+
+script:
+  - ./ci/script.sh
+
+after_script:
+  # Check how much free disk space left after the build
+  - df -h

ci/script.sh

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+#!/usr/bin/env bash
+
+set -eux
+
+# Install rustup and the specified rust toolchain.
+curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain=$RUST_TOOLCHAIN -y
+
+# Load cargo environment. Specifically, put cargo into PATH.
+source ~/.cargo/env
+
+rustc --version
+rustup --version
+cargo --version
+
+case $TARGET in
+	"native")
+		sudo apt-get -y update
+		sudo apt-get install -y cmake pkg-config libssl-dev
+
+		cargo test --all --locked "$@"
+		;;
+
+	"wasm")
+		# Install prerequisites and build all wasm projects
+		./init.sh
+		./build.sh --locked "$@"
+		;;
+esac