Remove -march=native to fix ARM builds

This flag breaks ARM builds and doesn't buy us much when building
on other architectures.
Merge pull request #164 from plfiorini/mnative

Remove -march=native to fix ARM builds
Add man pages

Man pages are generated from reStructedText using rst2man.
Closes #81.
Merge pull request #166 from plfiorini/manpages

Manpages