Remove unnecessary :::
Bump ver
emit appropriate warnings in R Markdown mode; collect <head> contents
Make normalizePath calls Windows-compatible.
have validateCssUnit treat unit-free character strings as pixel units
Merge pull request #437 from trestletech/winslash

Make normalizePath calls Windows-compatible.
use more idiomatic syntax for resolving rmarkdown.runtime
Merge pull request #436 from rstudio/feature/shiny-docs

Improved support for R Markdown Shiny documents
implementing the server-side selectize input

also added a new method shinysession$registerDataObj(), which was designed to be a general data retrieval method: we can store arbitrary data objects as "downloads", and return arbitrary http response based on the filter function; see renderDataTable() and updateSelectizeInput() for two examples