Update Covalent UI core library to beta.2

[zuzust]

It seems there is a bug in @covalent/core that prevents building for production.

See Teradata/covalent#319

Covalent beta.2 is out!

Further info: https://github.com/Teradata/covalent/blob/develop/docs/CHANGELOG.md#100-beta2-hotel-california-2017-02-23

[plastikaweb]

Would be it possible to add the next core changes when you do the PR?

• In angular-cli.json, change the styles attribute: "styles": [ "../node_modules/@covalent/core/common/platform.scss", "theme.scss", "styles.scss" ],

• In .gitignore add: /scripts/*.js or /**/*.js

[zuzust]

Sure!