merge rmarkdown-examples.Rproj and rmdexamples.Rproj
no need to import base packages
import shiny and methods in namespace

- R CMD check will warn against require() because shiny is not in Depends
- we need to Depends on methods for shiny to work
the missing doc for height
strip white spaces and append new line
tweak the doc of inlineEditor()
white spaces
for consistency with knit_print(): the order of arguments must be the same between the S3 function and method

for datatables, the `options` argument is not actually used, and we can just ignore it
roxygenize
bump version