initial go at -exclude for fisher
changed compare function to have "unsigned int"

in order to make this compile with clang on FreeBSD 10.
Merge pull request #143 from arjanvandervelde/patch-1

changed compare function to have "unsigned int"
restore defaukt precision in groupby
Merge branch 'master' of https://github.com/arq5x/bedtools2
add tutorial to docs
added tutorial
restore TOC
Merge pull request #146 from nkindlon/master

added -prec option, default 10. Updated unit tests for merge, map, jacca...
better tutorial
Merge branch 'master' of https://github.com/arq5x/bedtools2
reorganize contingency table
change fisher to use numbers of intervals rather than bases of overlap
scripts for comparing to shuffled
prevent < 0 in n21
add -m option to merge intervals
tuning, testing and docs for fisher
fix formatting of fisher table
Merge pull request #149 from daler/master

fix formatting of fisher table
merge conflicts. integrate @brentp's nice improvments to fisher.