dkiang 0bd21e2e46 Arrays updates (#488) ...

* Rewrote introduction and objectives

Took out old placeholders in Objectives and rewrote Introduction to be
more complete.

* Removed stock photo

* Added new Array Sorting Animations and Cover image

* Added missing activity

* Added maker component to rubric.

2017-08-02 22:04:13 -07:00

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