Merge pull request #7 from kern3020/master

fixed syntax error in MathJax code which prevents formula from rendering
adding viz code
removing spaces
need to make sure students dont try this file
Merge branch 'master' of https://github.com/genomicsclass/labs
Fixed refs and library calls

Fixed some hard references to "/Users/ririzarr" and added some library
calls to make knitr work.
Merge pull request #8 from jmgore75/user_fixes

Fixed refs and library calls
adding packages list
Merge branch 'master' of https://github.com/genomicsclass/labs
RNAseq changes
chip stuff and pkgs list fixes
removing cnv
running MACS example
commiting changes
Merge branch 'master' of https://github.com/genomicsclass/labs
chaning daset to set
forgot IR +,-,*
Merge branch 'master' of https://github.com/genomicsclass/labs
working on SNP
working on week 8 labs