Parallel hdf5

This pull request moves from serial to parallel libSplash I/O for data output and restart.
libSplash version 1.1 will be required (currently in [dev](https://github.com/ComputationalRadiationPhysics/libSplash/tree/dev) ).

This has been tested on hypnos using the LaserWakefield example with the following configurations:
(1,2,1), (1,3,1) and (2,2,1) GPUs with slide.
(1,2,1) GPUs without slide.
(1,4,1) GPUs w/o and w/ 1/2/3 slides

last dump before restart:
![pngimageelectrons_yx_0 5_001024](https://f.cloud.github.com/assets/5120640/1965679/4e5d193e-82bd-11e3-955f-7fa96290375c.png)

first image after restart with (2,2,1) after one slide:
![pngimageelectrons_yx_0 5_001056](https://f.cloud.github.com/assets/5120640/1965683/62b4d50c-82bd-11e3-9370-e150aff88746.png)

This pull is addressing the following issues: [#5](https://github.com/ComputationalRadiationPhysics/picongpu/issues/5), [#59](https://github.com/ComputationalRadiationPhysics/picongpu/issues/59)