Fix type inference for size
Fix failing test after rand change
Add code coverage tracking
Merge pull request #597 from IainNZ/patch-3

Add code coverage tracking
Update README.md
Merge pull request #598 from IainNZ/patch-3

Update README.md
Fixes for hashing changes (JuliaLang/julia#6624)
Show build status for master branch
Remove Blocks requirement

The relevant code has been moved to prototypes
Fix show(::DataFrameRow). Closes #589
Tighten up constructors
Replace nrow with size
Merge pull request #610 from JuliaStats/construct

Tighten up constructors