Adding Travis CI and Coveralls support

tool/travis.sh

Index: tool/travis.sh
diff --git a/tool/travis.sh b/tool/travis.sh
new file mode 100755
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+++ b/tool/travis.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Fast fail the script on failures.
+set -e
+
+function clean {
+  # This is a much more simple clean script, assuming git is available
+  pushd test
+  git clean -fdx
+  popd
+  pub install
+}
+
+clean
+
+dart --checked test/all_tests.dart
+
+# Install dart_coveralls; gather and send coverage data.
+if [ "$COVERALLS_TOKEN" ]; then
+  clean
+
+  pub global run dart_coveralls report \
+    --token $COVERALLS_TOKEN \
+    --retry 2 \
+    --exclude-test-files \
+    test/all_tests.dart
+fi