Add travis build

.settings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<settings>
+  <servers>
+	<server>
+	  <id>repo.spring.io</id>
+	  <username>${env.CI_DEPLOY_USERNAME}</username>
+	  <password>${env.CI_DEPLOY_PASSWORD}</password>
+	</server>
+  </servers>
+</settings>

.travis.yml

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+language: java
+before_install: git config user.name "$GIT_NAME" && git config user.email "$GIT_EMAIL"
+  && git config credential.helper "store --file=.git/credentials" && echo "https://$GH_TOKEN:@github.com"
+  > .git/credentials
+install: 
+  - mvn install -q -U -DskipTests=true -Dmaven.test.redirectTestOutputToFile=true
+  - ./src/main/asciidoc/ghpages.sh
+script: mvn --settings .settings.xml deploy -nsu -Dmaven.test.redirectTestOutputToFile=true
+env:
+  global:
+  - GIT_NAME="Dave Syer"
+  - GIT_EMAIL=dsyer@pivotal.io
+  - secure: WkOpm7S9tGG85vhmAej16RIJS1MxKKBsnwIa8/hDRONDba0iDBn4vmy8Nj/JuVAy3CVPd0UecQ8cJveqjnMK/3LSBH9G5B78cAfCkFfjPncMXfgn8f1l4uMOooIPYW/JNodSVwrTxPfGq+L8yYSLcIP1sqnvbz6IGw6Ni1p6wUQ=

src/main/asciidoc/ghpages.sh

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+#!/bin/bash -x
+
+git remote set-url --push origin `git config remote.origin.url | sed -e 's/^git:/https:/'`
+
+if ! (git remote set-branches --add origin gh-pages && git fetch -q); then
+    echo "No gh-pages, so not syncing"
+    exit 0
+fi
+
+if ! [ -d target/generated-docs ]; then
+    echo "No gh-pages sources in target/generated-docs, so not syncing"
+    exit 0
+fi
+
+# Stash any outstanding changes
+###################################################################
+git diff-index --quiet HEAD
+dirty=$?
+if [ "$dirty" != "0" ]; then git stash; fi
+
+# Switch to gh-pages branch to sync it with master
+###################################################################
+git checkout gh-pages
+
+for f in target/generated-docs/*; do
+    file=${f#target/generated-docs/*}
+    if ! git ls-files -i -o --exclude-standard --directory | grep -q ^$file$; then
+        # Not ignored...
+        cp -rf $f .
+        git add -A $file
+    fi
+done
+
+git commit -a -m "Sync docs from master to gh-pages"
+
+# Uncomment the following push if you want to auto push to
+# the gh-pages branch whenever you commit to master locally.
+# This is a little extreme. Use with care!
+###################################################################
+git push origin gh-pages
+
+# Finally, switch back to the master branch and exit block
+git checkout master
+if [ "$dirty" != "0" ]; then git stash pop; fi
+
+exit 0