cosmetic: rewrap roxygen comments and reindent code
update package URL
cosmetic
add CITATION info for JSS
all datasets are lazyloaded now (LazyData: yes), so no need to use data()
add citation in ?animation
update references: some have been moved to vistat
roxygenize
tweak description
news for version 2.2
roxygenize
add .travis.yml to enable testing on Travis CI
bump version; I think it is ready for CRAN now