Remove unused files and strip scripts and unused files from published crate

[bluss]

Remove some old unused code (spare_kernels) and old unusable performance logs.

Keep tests in the crate so that crater can run tests, which is important.

Closes #94

[bluss]

The package file list with this PR:

.cargo_vcs_info.json
.gitignore
Cargo.lock
Cargo.toml
Cargo.toml.orig
LICENSE-APACHE
LICENSE-MIT
README.rst
build.rs
src/aarch64/macros.rs
src/aarch64/mod.rs
src/aligned_alloc.rs
src/archmacros.rs
src/archparam.rs
src/archparam_defaults.rs
src/cgemm_common.rs
src/cgemm_kernel.rs
src/constparse.rs
src/debugmacros.rs
src/dgemm_kernel.rs
src/gemm.rs
src/kernel.rs
src/lib.rs
src/loopmacros.rs
src/packing.rs
src/ptr.rs
src/sgemm_kernel.rs
src/threading.rs
src/util.rs
src/x86/macros.rs
src/x86/mod.rs
src/zgemm_kernel.rs
testdefs/testdefs.rs
tests/sgemm.rs