Added missing calls in order for the example to work.

[Zlate87]

Hi

For me the first example (example1) was not working. After some investigation, the problem was because the build() method was never called on the builder, configure() method was never called on the session and start() method was not called once the session was configured.

With this changes the example is working for me.

[angularsen]

FYI, here is the pull request of the changes I mentioned. https://github.com/fyhertz/libstreaming/pull/150