MultiVar Examples were mismarked as Standard.
Fix typo in R Programming->Subsetting Vectors

Replace postive with positive
Merge pull request #23 from ozancaglayan/patch-1

Fix typo in R Programming->Subsetting Vectors
In Central Tendency, masked old runTest.equivalent with custom test which wraps omnitest.
minor change
Merge pull request #24 from swirldev/runTest_equivalent

Solves swirl issue #171 for Data Analysis, Central Tendency
Update lesson.csv
Merge pull request #25 from map0logo/patch-1

Update lesson.csv
fixed a typo in lesson 6
Merge pull request #26 from szarka/master

fixed a typo in lesson 6
Merge branch 'master' into devel