chore: add framework for various integration tests

integration-testing/multi-nodejs-test/.eslintrc.js

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+module.exports = {
+  "extends": "eslint:recommended",
+  "globals": {
+    "self": false
+  },
+  "env": {
+    "node": true
+  },
+  "rules": {
+    'no-console': 'off'
+  }
+}

integration-testing/multi-nodejs-test/.gitignore

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+target

integration-testing/multi-nodejs-test/precompile-test-template.txt.hbs

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+Author: {{author}}

integration-testing/multi-nodejs-test/run-handlebars.js

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+// This test should run successfully with node 0.10 as long as Handlebars has been compiled before
+var assert = require('assert');
+var Handlebars = require('../../');
+
+console.log('Testing build Handlebars with Node version ' + process.version);
+
+var output = Handlebars.compile('Author: {{author}}')({author: 'Yehuda'});
+if (output !== 'Author: Yehuda') {
+    throw new Error('Compiled output (' + compiledOutput + ') did not match expected output (' + expectedOutput + ')');
+}
+
+assert.equal(output, 'Author: Yehuda')
+
+console.log('Success');

integration-testing/multi-nodejs-test/test.sh

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+#!/bin/bash
+
+cd "$( dirname "$( readlink -f "$0" )" )" || exit 1
+[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
+
+# This script tests with precompiler and the built distribution with multiple NodeJS version.
+# The rest of the travis-build will only work with newer NodeJS versions, because the build
+# tools don't support older versions.
+# However, the built distribution should work with older NodeJS versions as well.
+# This test is simple by design. It merely ensures, that calling Handlebars does not fail with old versions.
+# It does (almost) not test for correctness, because that is already done in the mocha-tests.
+# And it does not use any NodeJS based testing framwork to make this part independent of the Node version.
+
+# A list of NodeJS versions is expected as cli-args
+echo "Handlebars should be able to run in various versions of NodeJS"
+for i in  0.10 0.12 4 5 6 7 8 9 10 11 ; do
+    rm target -rf
+    mkdir target
+    nvm install "$i"
+    nvm exec "$i" node ./run-handlebars.js >/dev/null || exit 1
+    nvm exec "$i" node ../../bin/handlebars precompile-test-template.txt.hbs -f target/precompile-test-template.js || exit 1
+    echo Success
+done