Easy plural

[dswah]

• makes setting term attributes more consistent so:

gam = GAM(terms='auto')
gam.n_splines = 5

doesnt fail and is equivalent to

gam = GAM(s(0, n_splines=5))

• term parameters should be easier to broadcast:

GAM(terms=s(0) + s(1), n_splines=10)

is equivalent to

GAM(terms=s(0, n_splines=10) + s(1, n_splines=10))

[codecov]

Codecov Report

Merging #199 into master will decrease coverage by 0.25%.
The diff coverage is 96.15%.

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
- Coverage   94.92%   94.67%   -0.26%     
==========================================
  Files          22       22              
  Lines        3016     3002      -14     
==========================================
- Hits         2863     2842      -21     
- Misses        153      160       +7

Impacted Files	Coverage Δ
pygam/tests/test_GAM_methods.py	100% <ø> (ø)	⬆️
pygam/pygam.py	94.43% <96.15%> (ø)	⬆️
pygam/core.py	90.62% <0%> (-9.38%)	⬇️
pygam/terms.py	93.41% <0%> (-0.22%)	⬇️

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