build: i18n: WIP- autodownload. joyent#7676
build: i18n: WIP - auto-download and unpack ICU. joyent#7676
build: i18n: windows work, refactor

* start to refactor download module
* work on the windows files
Merge branch 'srl-v0.12-autoicu' of https://github.com/srl295/node into srl-v0.12-autoicu

Conflicts:
	configure