Jenkins build

Required [this](https://github.com/readium/readium-sdk/pull/55) pull request in readium-sdk, to be in the readium-sdk submodule in this repo but, overall this adds :

* a generated build.xml for building through jenkins

There is a jenkins plugin that will generate this script but I was not sure if/how it could be modified after it was generated so I opted to just generate it now and get it checked into the repo to avoid that problem.

Running ````ant debug```` with this build.xml will actually find the dependency on readium-sdk and run off and compile that as well. The project name in the build.xml needs to be updated but that can be done at anytime.

@rkwright, this can wait until the develop branch is ready to be modified again.