allow specify ylab using do.call instead of calling plotting function directly
added SO link to do.call chunk
removed ymax argument in favor of specifying ylim in ...
updated vignette
using knitr::knitr instead of knitr::markdown to render vignette to keep file size under control
added axis label option, updated vignette
Update README.md
added gif demo
Merge branch 'dev' of https://github.com/stephenturner/qqman into dev
citation details on package load
moved animated gif to assets dir to avoid r build problems
tracking .Rbuildignore
removed default xlim
updated qq to allow setting graphical parameters using the same plan as with manhattan()
rebuild vignettes after qq mod
Change x-axis ticks to Mega bases(Mb) and add colour when plotting one CHR.

Like the over all feel of the plot bether without scientific notation for the base positions.
Add the specified colour to plot when plotting one CHR.
Merge pull request #18 from timknut/dev

Change x-axis ticks to Mega bases(Mb) and add colour when plotting 1 Chr.
Dont assume that SNPs are evenly distributed across chromosomes. Contributed by Miles Benton
Merge branch 'centerticks' into dev
updated vignette with zscore example