composer installで"the requested PHP extension intl is missing from your system."というエラーが出たので対応した．

# composer installで"the requested PHP extension intl is missing from your system."というエラーが出たので対応した．
# HomebrewでPHP7を入れている人向け．

# error
$ composer install
> Loading composer repositories with package information
> Installing dependencies (including require-dev)
> Your requirements could not be resolved to an installable set of packages.
> Problem 1
> - cakephp/cakephp 3.0.x-dev requires ext-intl * -> the requested PHP extension intl is missing from your system.

$ brew install php70-intl

# success
$ composer install