trying vignette as in r-packages book
rearranging vignette
vignette in Rmd format
updated Rmd vignette
Work in progress on collocations for trigrams.
compressed data; added two new methods to collocations(); removed non-UTF-8 quotes from vignette.
updated the Rmd vignette (and fixed merge conflict)
Merge branch 'dev'

Conflicts:
	.gitignore
	DESCRIPTION
	quanteda.pdf