don't wrap GSL functionality that is redundant with the Julia standard library

[stevengj]

There are some portions of GSL that are so redundant with the Julia standard library that it is almost inconceivable that anyone would want to use them.

The whole GSL vector and matrix interface, the BLAS interface, the linear algebra and eigensystems interfaces, the FFT functions, and the basic complex-number routines are vastly inferior to those bundled with Julia, for example, and I would tend to just omit them from GSL.jl.

Including them increases your maintenance load, requires special care to avoid crashing interactions with the garbage collection (issue #11), and slows down the loading of the GSL package (using GSL is pretty slow as it is, so anything to trim the library would be an improvement).

[jiahao]

I agree with removing everything that is redundant with Julia's existing functionality. The BLAS interface was the one thing I noticed right away, and I simply hadn't taken the time to list and excise the various redundant classes of things. I'll certainly remove the ones listed above right away to begin with.

[jiahao]

I've explicitly removed gsl_eigen__, gsl_complex__, gsl_sort__, gsl_vector__, gsl_matrix__, blas_, cblas_, gsl_fft_, gsl_linalg* wrappers. Do let me know if I've missed anything.