Add a list of generated files to .gitignore
Use explicit filenames rather than globs
BUG: special/specfun: fix bug in MTU12

Off-by-one error in the order up to which the Bessel functions were
computed (the arrays are accessed up to KM+1). Doesn't seem to affect
results much as the series seems mostly to converge before reaching the
limit.

Covered by test_mathieu_modsem2 (see Trac #1847)
BUG: optimize/lbfgsb: fix a code path printing even when iprint < 0
Merge pull request #480 from timleslie/update_gitignore

MAINT: Update .gitignore with generated files
Merge pull request #489 from pv/mathieu-bug

BUG: special/specfun: fix bug in MTU12