Add support for MIMO systems.
BUGFIX: fix issue #25, FF structure support
BUGFIX: don't break Python3 support
Add test for FF structures.
DOC: formatting
PEP8, add test for n int.
DOC: Add figure, rewording, seealso.
PEP8: enforce.
PEP8: fixes.
DOC: fixes.
DOC: plot legend, better wording.
MINOR: pep8 indent.
PEP8: enforce.
DOC: fix references.
MINOR: introduce f_p immediately
MINOR: initial work for 0.2
MINOR: test warnings.
QUICKFIX: add keyword to catch_warning to restore Python3 compatibility
QUICKFIX: add keyword to catch_warning to restore Python3 compatibility
PEP8: refactoring, remove unneded imports