Merge from github/seajs/seajs 2.2.x branch

Add annotation info

build

set cwd to an empty string if locatoin.href is unusual seajs#1225

seajs#1225

Revert "emit support multi data params"

This reverts commit 3949dd4.

restore document from global.document

has a bug in nodes to access global.document

Tagging the 2.1.1 release.

Tagging the 2.1.0 release.

Tagging the 2.0.0 release.

Tagging the 1.3.1 release.