Merge pull request #3 from rstudio/refactor/explicit-options

Hoist options into explicit arguments
Use verbs for function names
Remove "Map" from function names
Merge pull request #4 from rstudio/refactor/verb-function-names

Use verbs for function names
Add BugReports and Issues to DESCRIPTION. Add RStudio as copyright holder
Make title little less likely to cause problem with CRAN
Merge branch 'master' of github.com:rstudio/leaflet
use stringsAsFactors = FALSE
use new layer function names in examples
add a data argument to leaflet()
avoid evaluating the arguments specified in `excludes`
adjust the examples after changes in #3
renamed appendList() to appendMapData(); added a new function evaluateFormula() to evaluate list members that are formulae using the data as the environment if possible
an example of using the formula interface
roxygenize
use the formula environment as the enclosing environment of eval()
add an example in which radius is not from the data
more name changes: addTiles() and addCircleMarkers()