Disable ftp support for Crosswalk.

use 'disable_ftp_support' and comment out some code path.
Using icu alternatives on Android

All changes are protected by gyp flat
use_icu_alternatives_on_android
Disable ftp by default when use icu alternatives
Disable the i18n support of v8
Disable icu in sqlite
Disable icu in libxml by reverting third_party/libxml/patches/icu
Remove dependency to libphonenumber
Do not initial ICU anymore.
Merge pull request #202 from wang16/mini_remove_icu

[Crosswalk Mini] Remove ICU dependency