s/BiPy/bipy/g

:godmode:
s/Copyright (c) 2013,/Copyright (c) 2013--,/g

per @Jorge-C's suggestion
s/The bipy Developers/bipy development team/g
Merge pull request #104 from jrrideout/issue-44

s/BiPy/bipy/g
MAINT: delete credits and version
Merge pull request #107 from Jorge-C/remove_credits

MAINT: delete credits and version
Remove asserts...

... as I found a case with real data where one of them failed (but vegan
didn't complain). The biplot is virtually the same. Replaced by a comment.
TST: reformat data file
TST: reformat data file
TST: Add testing for RDA scaling 1
TST: Add tests for RDA scaling 2
TST: CCA test (scaling 1, species)
TST: CCA test (scaling 2, species)
BUG: Fix computation of residual site scores
MAINT: More explicit way to assign scores.
TST: CCA test (scaling 1, site scores)
TST: CCA test (scaling 2, site scores).
TST: Ups
DOC: Fix typos when citing data.
TST: remove perfect collinearity from test.

We'll need to figure out what (if anything) does R do to deal with
collinearity.