update changelog for npm@1.4.24
Remove unpublish step from make publish

Doesn't work that way any more anyway
Remove outdated docpublish make target
Add script to output 'v1.4-next' publish tag
Publish with --tag=v1.4-next
Add 'make tag' to tag current release as latest
doc: update version doc to include pre-* increment args
build: explicitly push to a branch
update changelog for npm@2.0.0-alpha.7
2.0.0-alpha.7