Added failing test for nice() on millisec interval
Added floor() and ceil() to millis interval
Use d3_identity.
Merge branch 'fix-subscale-time-scale-nice'
Merge remote-tracking branch 'remotes/mbostock-original/master'

Conflicts:
	d3.min.js
updated Makefile to the latest state of affairs (in the all_scales_have_subticks branch)
sync other support files as well
regenerated library files