first stab at updates to the permutations Rd file
final round of edits for draft of revised intro to permutations for vegan users
add davison and hinkley reference
sampleSet -> shuffleSet typo
Merge pull request #57 from gavinsimpson/improve-permutations-rd

Improve permutations.Rd
some minor tweaks, fixes for typos, and a clarification
pass relevant named arguments from anova.cca to permutest.cca
Merge pull request #60 from gavinsimpson/fix-argument-passing-in-anova

pass relevant named arguments from anova.cca to permutest.cca