Merge pull request #1 from juba/master

Merging version 0.3
Merge pull request #2 from juba/master

Derniers ajouts de juba
odds.ratio.multinom n'était pas correctement exportée
Odds ratios are the exponential of coefficients
calling summary only once
Need to take into account the case where main outcome has only two levels
a more explicit name
Merge pull request #32 from larmarange/issue31

Fixing several bugs in odds.ratio.multinom