Merge pull request #1 from bioconnector/rnaseq-rmd

Merging this in. Still need to fix a few things @liz-is and @rbeagrie. HTML not compiling because trying to `install.packages(...)` without specifying a mirror. Perhaps best to include the package installation commands in a chunk with `eval=FALSE` so doesn't download package every time try to compile.
fixed conflicts
do not evaluate install.packages
Merge pull request #2 from bioconnector/rnaseq-rmd

do not evaluate install.packages
fixed so compiles to html; added back the removal of unexpressed genes
merged conflicts; install packages in uneval chunk
added .md file
named chunks
# for headings
Merge pull request #5 from liz-is/master

Named chunks
added an exercise to find max expressed gene
exercise formatting
added some explanatory text
Merge pull request #6 from liz-is/master

Added exercises. Go back and set `echo=FALSE` on chunks with solutions to exercises?
added LOs and preliminary agenda for rna-seq bootcamp
commented about eventbrite registration
changed to bioconnector instead of bioinformatics core on site title
added retina support to favicon
Remove padding from code blocks

Fixes jekyll/jekyll#2506
Merge pull request #7 from pathawks/patch-1

Remove padding from code blocks