Updating pinny with appendTo option

[scalvert]

Adding an appendTo option, which allows us to specify where to append the pinny.

Status: Ready to merge

Reviewers: @kpeatt @tedtate JIRA: https://mobify.atlassian.net/browse/CSOPS-921 Linked PRs: https://github.com/mobify/lockup/pull/6 - THIS PR NEED MERGING FIRST

Changes

• adding appendTo option
• updating container reference to use lockup's instance property

  How to test-drive this PR

• checkout this branch
• grunt test
• grunt serve and make sure stuff isn't broken

TODO:

• [ ] Update lockup version number when branch is merged

[scalvert]

@kpeatt @tedtate OK this is ready to go now!

[tedtate]

grunt test is broken for me right now. Is there any additional requirements? I'm dumb.

[tedtate]

+1