Angular2App should allow you to import assets

[rodyhaddad]

Similar to EmberApp's import method, our Angular2App should have an import method, allowing you to include assets that will end up in the concatenated dist files.

In practice this will often be used by addons in their included hooks. (#7)

[filipesilva]

#135 seems to have addressed this. If not, please reopen this issue.

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