add script to run astyle

At CMake time, one script run_astyle.sh is generated into the binary folder. By
running thisc script all source files would be formatted following google
style.
format using new astyle script
Switch to Boost 1.55 (fixes #95)
Merge pull request #98 from statismo/boost_1.55

Switch to Boost 1.55 (fixes #95)
Merge pull request #97 from statismo/astyle

code formatting (google style)
Merge branch 'develop' into factoredout_nystrom

Conflicts:
	modules/core/include/LowRankGPModelBuilder.h
fixed more cast issues
fix issues from Arnaud's review
Merge branch 'factoredout_nystrom' of github.com:statismo/statismo into factoredout_nystrom

Conflicts:
	modules/core/include/LowRankGPModelBuilder.h
Merge branch 'factoredout_nystrom' into spatially_varying_kernel

Conflicts:
	modules/VTK/src/vtkStandardMeshRepresenter.cxx
	modules/core/include/Kernels.h