[DOC] Added index dox docu.
[FIX] Parallel: fixed order of CUDA/OpenMP in getThreadId()
[FEATURE] Build System: added support for CUDA demos
[FEATURE] CUDA Demos: hello world
[FEATURE] CUDA Demos: mmap demo
[FIX] Build System: fixed linking flags
[FEATURE] Device: added ExecSpec metafunction
[FEATURE] Finder: added OccurrencesCounter functor
[INTERNAL] Finder: included functors header into the index_extras header
[CLI, INTERNAL] CUDA Demos: prepared counting demo
[CLI] CUDA Demos: prepared mmap demo
[INTERNAL] CUDA Demos: prepared hello demo
[DOC] Corrected function signatures.
Merge branch 'develop' of https://github.com/seqan/seqan-svn into develop