Update README.md

You probably would have changed this eventually.
Merge pull request #5 from mdshw5/patch-1

Update README.md
Merge pull request #4 from jtleek/master

I added .gitignore which we'll take out when we submit to Bioc. I also allowed baseline simulation in generate_read_numbers
adds vignette.md to gitignore
changes parameter name: dispersion_param --> size
add jeff as contributor in vignette
email update
add explicit ballgown:: to call to structure
bug fix re: threshold default in fpkm_to_counts
adds more error checking in get_params
adds examples to all man pages
update contact email
add gtf_dataframe.rda to package data (for examples)
fix documentation (per issue #2, comment 45896986)
add documentation for gtf_dataframe dataset