Release candidate for CUDA code gen

This is release candidate 1 for the CUDA code generator by @DeLaVlag & @sdiazpier, which is stable by now, but may require some bug fixes following more extensive testing.

DSL v2.0 and automatic code generation with CUDA backend

Merge pull request #29 from DeLaVlag/dsl-CUDA

The pull request adds the next version of the TVB DSL and code generation for CUDA backend.

v0.2-alpha

This release includes the version 2.0 of the DSL for python and CUDA kernels.

v0.1-alpha

This pre-release encloses the initial framework, examples and tests related to the development of the DSL and the automatic code generation for TVB-HPC using templates.