Fixing example in readme
fixing xor for adjacent ranges
some cleanup
working exclusion
progress on exclusion
renamed excluded to difference, added all-day support for xor and difference
adding split()
Merge branch 'xor' into develop
new badges!
fixing badges
Update README.markdown
add simple microbenchmarks
avoid cloning moments whenever possible

Cloning moments is sloooow. Cache computed moments whenever possible for
a massive speedup.