Merge pull request #27 from cdrv/gh-pages

Fix bad markdown in my latest post
escape html in pre blocks
new post by Christian and Jonathan
new contributions from Jonathan
modified the _scripts/knit.sh shebang to make it more portable
first version of the RcppProgress article
Merge pull request #28 from kforner/gh-pages

RcppProgress article v1
update for compatability with jekyll 1.0
cope with Jekyll 1.0 and prior versions -- we just test for major 0.* or not
fixed typos
Merge pull request #29 from kforner/gh-pages

RcppProgress article v2
sobol indices article
Merge branch 'gh-pages' of github.com:jjallaire/rcpp-gallery into gh-pages
mention cpp11 plugin
display more entries on home page
mention c++1 plugin 2/2
remove quotes from plugin invocation
some small edits throughout
Fast Multivariate Normal Densities as .RMD

Submission based on SO thread:
http://stackoverflow.com/questions/17617618/dmvnorm-mvn-density-rcpparmadillo-implementation-slower-than-r-package-includi
as commented