Added needed section to deploy to maven central. Adding travis-settings to be able to publish to maven central (through oss.sonatype) on push to uber/hoodie master

deploy/maven/sonatype-settings.xml

@@ -0,0 +1,28 @@
+<!--
+  ~ Copyright (c) 2016 Uber Technologies, Inc. (hoodie-dev-group@uber.com)
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~           http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
+                              http://maven.apache.org/xsd/settings-1.0.0.xsd">
+  <servers>
+    <server>
+      <id>ossrh</id>
+      <username>${env.SONATYPE_USERNAME}</username>
+      <password>${env.SONATYPE_PASSWORD}</password>
+    </server>
+  </servers>
+</settings>

deploy/scripts/publish.sh

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+#!/usr/bin/env bash
+
+set -e
+
+SCRIPT_DIR=`dirname $0`
+DEPLOY_DIR=$SCRIPT_DIR/..
+openssl aes-256-cbc -pass pass:$gpg.passphrase -in $DEPLOY_DIR/pubring.gpg.enc -out pubring.gpg -d
+openssl aes-256-cbc -pass pass:$gpg.passphrase -in $DEPLOY_DIR/secring.gpg.enc -out secring.gpg -d