[Fix #551] Indent clojure-align region before aligning.

[kylc]

This prevents issues when aligning improperly indented code. Before, the region
would be aligned while retaining the improper indentation. The follow-up
indentation step would then break the alignment that was just performed.

With this commit, we switch the order by indenting first then aligning. This
retains compatibility with the test cases in #360.

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• The commits are consistent with our contribution guidelines.
• You've added tests (if possible) to cover your change(s). Bugfix, indentation, and font-lock tests are extremely important!
• You've run M-x checkdoc and fixed any warnings in the code you've written.
• You've updated the changelog (if adding/changing user-visible functionality).
• You've updated the readme (if adding/changing user-visible functionality).

Thanks!

[bbatsov]

The change looks good, but it might be a good idea to add an unit test as well.

[kylc]

I've updated the commit to include a unit test for the case described in the bug report.

Thanks for taking the time to review!

[bbatsov]

Sorry for the slow turnaround here. Didn't have much time for clojure-mode recently.