Allow to pass --configuration and other parameters when building

[pontusr]

Description

We need to be able to add parameters such as --configuration to the build so that we can do for example: ng build electron --configuration=production

Expected Behavior

ng cli parameters should work as expected

Actual Behavior

--configuration parameter is ignored - all others cause error when building.

Steps to Reproduce

1. npm install -g @angular/cli
2. ng new my-dream-app
3. cd my-dream-app
4. ng add @electron-schematics/schematics
5. ng build electron --configuration=production