argparse support added to first file

argparse support added to abund-ablate-reads.py
Merge pull request #307 from RamRS/sbox-argparse

Adding argparse support to sandbox
Merge branch 'master' into refactor/cython_bindings
fix jenkins calling of gcovr
Merge branch 'master' into refactor/cython_bindings
Make khmer at least importable, wrap hash functions