Updated qc demo to include HWE calculations

Updated QC-demo.md and HWE query to include calculations for expected values, chi squared value, and a boolean for p-value significance.
Regarding the sort, I see what you mean @gregmcinnes  I think we just need to sort the anti_join results, as you mention.
```
onlyBQ <- anti_join(result, expectedResult, by=c("CHR", "POS"))
arrange(onlyBQ, CHR, POS)
```