hadley/ggplot2 — pull request #643 by wch (2012-08-07 18:12:38+00:00)
Title: Remove memoise

This fixes #592. It passes all tests, and visual tests are unchanged.

It did make a warning go away in a couple visual tests in `scale-date.r`, though:

```
dt + scale_x_date(breaks = "3 weeks")
# Warning message:
# 'package:ggplot2' may not be available when loading
```