XD-2307 Update Hadoop dependencies for 1.1.x

- Updates to use Spring for Apache Hadoop 2.1.0.M2

- Adds Pivotal HD 2.1 support (version 2.2.0-gphd-3.1.0.0) (phd21)

- Pivotal HD 2.0 and 2.1 will now use the same jars (phd21)

- Updates CDH 5 version to 2.5.0-cdh5.2.0 (cdh5)

- Adds support for Apache Hadoop 2.5.1 (hadoop25)

- Makes hadoop25 the default

- Removes support for Apache Hadoop 2.2.0 (hadoop22)

- Removes support for Pivotal HD 1.1 (phd1)

- Updates options for the hdfs-dataset sink

  - new basePath and namespace parameters replacing directory

  - new writerCacheSize parameter for partition writers cache size

- Updates servers.yml for YARN deployment with latest changes to config/servers.yml
XD-2270 Upgrading to Spring Boot 1.2.0.RC1

- adding showBanner(false) due to Boot issue #1918
XD-2340 Build: Ensure that branch-specific documentation is pulled and generated

* Update `build.gradle`
* Add ability to specify a custom wiki branch

````
    $ ./gradlew pullDocs -PwikiBranch=origin/mycustombranch
````

* By default the doc branch is the same as the XD branch

Jira: https://jira.spring.io/browse/XD-2340

* Address Code review comments
XD-2352 : Property replacement does not happen in XML class attribute

Temporary workaround
XD-2354 Adding property to avoid template check

- The GroovyAutoconfiguration now look for a classpath:template/ directory, need to disable this check