define max-width instead of width for better fit with Rstudio Viewer
move some parsing code from parse_block() to split_file() to "purify" parse_block(): it no longer involves patterns
bump version [ci skip]
fix the bug reported by @bbolker at http://stackoverflow.com/q/26726388/559676
bump version

[ci skip]
no need to write [] after \begin{figure} if fig.pos is empty
closes #886: add a note about using kable() inside other expressions
bump version [ci skip]
Fix the toggle_R() example.

See example: 
It appears pandoc no longer uses class "sourceCode r", but rather just 'r'. 

Rpubs: http://rpubs.com/Kevin-M-Smith/39263

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