* added skipFirs arg to observeEvent
* create getCurrentObserver() function
* better NEWS entry
* made code more consistent
* implemented `once` param to `observeEvent`; extensive documentation for `getCurrentObserver`
* implement dig param to `getCurrentObserver`
* fix bug that was causing unit tests to fail
* take two
* git commit
* removed function getCurrentObserver
* delete .globals$currentObserver variable
* update docs
* typo
* remove dupes in index.r (bah humbug)
* rerun devtools::document
After discussing with @trestletech, the semantics are just not right.
When using it with a renderXXX function, it doesn't actually stop
recomputation, so the only reasonable place to use it is in a reactive
expression, but if that's true then this is a terrible looking API.
Will replace soon with something better.
