Error(s) in re-building vignettes:
  ...
--- re-building ‘a_introduction.Rnw’ using knitr
Error: processing vignette ‘a_introduction.Rnw’ failed with diagnostics:
Running ‘texi2dvi’ on ‘a_introduction.tex’ failed.
LaTeX errors:
! Missing $ inserted.
<inserted text> 
                $
l.103 ...ll.packages("devtools")devtools::install_
                                                  github("csgillespie/poweRl...
! Emergency stop.
<inserted text> 
                $
l.103 ...ll.packages("devtools")devtools::install_
                                                  github("csgillespie/poweRl...
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘a_introduction.Rnw’

--- re-building ‘b_powerlaw_examples.Rnw’ using knitr
Error: processing vignette ‘b_powerlaw_examples.Rnw’ failed with diagnostics:
Running ‘texi2dvi’ on ‘b_powerlaw_examples.tex’ failed.
LaTeX errors:
! Missing $ inserted.
<inserted text> 
                $
l.103 m_
        pl = displ$new(moby)
! Emergency stop.
<inserted text> 
                $
l.103 m_
        pl = displ$new(moby)
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘b_powerlaw_examples.Rnw’

--- re-building ‘c_comparing_distributions.Rnw’ using knitr
Error: processing vignette ‘c_comparing_distributions.Rnw’ failed with diagnostics:
Running ‘texi2dvi’ on ‘c_comparing_distributions.tex’ failed.
LaTeX errors:
! Missing $ inserted.
<inserted text> 
                $
l.120 m1 = displ$new(x)m1$setPars(estimate_
                                           pars(m1))
! Emergency stop.
<inserted text> 
                $
l.120 m1 = displ$new(x)m1$setPars(estimate_
                                           pars(m1))
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘c_comparing_distributions.Rnw’

--- re-building ‘d_jss_paper.Rnw’ using Sweave
--- finished re-building ‘d_jss_paper.Rnw’

SUMMARY: processing the following files failed:
  ‘a_introduction.Rnw’
  ‘b_powerlaw_examples.Rnw’
  ‘c_comparing_distributions.Rnw’

Error: Vignette re-building failed.
Execution halted