compiling elasticsearch transport couchbase

Just in case you ever need a bug solved before it makes it into a release.

1. Install Maven
2. git clone https://github.com/couchbaselabs/couchbase-capi-server.git
   1. cd couchbase-capi-server
   2. mvn install
   3. Make note of the version number of couchbase-capi-server
3. git clone https://github.com/couchbaselabs/elasticsearch-transport-couchbase.git
   1. cd elasticsearch-transport-couchbase
   2. git checkout 2.es.ver
   3. vim pom.xml and make sure the version of couchbase-capi-server matches the one installed
   4. mvn package

We did this to solve this issue we were having https://github.com/couchbaselabs/elasticsearch-transport-couchbase/issues/153