Refactor quasirandom functions

[csdaw]

Hi there,

Here is the next PR, this time for quasirandom functions.

Changes made in this PR:

• geom_quasirandom(), the groupOnX argument has been deprecated. Axis grouping is now automatic by using ggplot2::flipped_aes() internally.
• position_quasirandom(), the groupOnX argument has been deprecated.
• PositionQuasirandom has been rewritten in a similar way to PositionBeeswarm.
• offset_quasirandom() has been created and functions in a similar way to offset_beeswarm().
• The quasirandom plots in the README have been updated. All plots are identical except those using the "tukeyDense" or "pseudorandom" methods which are highly similar.

Addresses #49 Partially addresses #47

[eclarke]

Hi @csdaw, is this pull request still open given the latest (#64)? If it is I'll merge it, otherwise we can close

[csdaw]

Yep @eclarke, this PR is still open 😄.

For the 4 conflicting README image files, the files currently already in eclarke::master should take precedence over the ones from csdaw::refactor-quasirandom which are out of date.

[eclarke]

Hi @csdaw, apologies for the delay in approving this. Since you've been a huge help in replying to outstanding issues and contributing code fixes, I've invited you to be a contributor to the repository. This should make it so that you don't have to wait for me to approve/merge changes, close outstanding issues, etc (though of course, please don't feel like this is any kind of obligation!) Thank you for all your work so far, it's tremendously appreciated.

[csdaw]

Hi @eclarke, thank you I'd be happy continue maintenance on the code/repository (and in time prepare things for an update to CRAN). Would you be able to re-send the contributor invitation? I've been a bit busy the past few months but things are clearing up for me now.

[eclarke]

Just re-sent!