doc: i18n: add license content from ICU

[srl295]

Node, when built with ICU, should present ICU's license.

Added license info from:
http://source.icu-project.org/repos/icu/icu/trunk/license.html
All text pasted. Long lines wrapped. (original is HTML.)

Note wording that ICU's license may or may not apply, if node isn't
built with it.

[srl295]

Maybe the build process could add some tools/icu/ICU-LICENSE to the LICENSE file. (Or at that point, it could reformat deps/icu/license.html and be super up to date)

[misterdjules]

Adding to the 0.11.15 milestone as installers will start shipping with ICU enabled from that release.

[misterdjules]

Thank you! Two comments:

• The wording about the fact that the ICU license may or may not apply should be removed (as well as the corresponding explanation in the commit message). The LICENSE file is included and displayed as is in the package installers, and in that case it applies all the time.
• The newline at the end of the file was removed, could you please put it back?

Other than that, LGTM!

[srl295]

@misterdjules fixed. I left the URL in place but can remove that also.

[tjfontaine]

Longterm for improving the installers in general it would be nice if we broke out each license, but this LGTM

[misterdjules]

@srl295 Thanks! Landed in 70d04e7.

[srl295]

@misterdjules can you add the i18n tag here also please? thanks