Adds regression test for issue #37
Fixes #37

* The issue had to do with indenting and a missing marker, resulting in
the registered position for the new var being shifted when the region is
indented.
Merge pull request #38 from magnars/extract-var

Fixes #37
Fix move-line-up function
Merge pull request #41 from Ryckes/master

Fix move-line-up function
Keep column in move-line-up
Merge pull request #42 from Ryckes/master

Keep column in move-line-up