feature(generate): give possibility to generate custom blueprint defined in project

[feloy]

References #2377

Here is a patch that should give back the possibility to use custom blueprints from an angular-cli project.

I've created a demo app using this functionnality: https://github.com/feloy/angular-cli-custom-blueprints-demo

[hansl]

This functionality will come back after addons are supported.

[josersleal]

try angular-cli-tools

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