add id parameter to navbarPage (support for tab input binding)
simplify handling of nested menus in tabInputBinding
update docs on updateTabsetPanel to reflect it's applicablity to navbarPage and navlistPanel
Merge pull request #348 from rstudio/feature/navbar-input-binding

add id parameter to navbarPage (support for tab input binding)
need to run roxygen2
show the log files after R CMD check failures