Fix PkgEval badge
Merge pull request #687 from IainNZ/patch-1

Fix PkgEval badge
Use ReadTheDocs
Fix #690
Run Travis tests on releases too
Only attempt to submit code coverage results on nightlies
Fix #693
Make Index work with julia0.4 after Dict revamp.

Also squashes bug (in push!(::DataFrame, ...)) exposed by change.
Merge pull request #696 from JuliaStats/basedict

Make Index work with julia0.4 after Dict revamp.
Track Julia 0.4 Dict changes
Align comments
Merge pull request #698 from JuliaStats/trackdict

Track Julia 0.4 Dict changes
support for three+ way interactions, proper handling of associative and distribute rules in formulas, and R-compatible ordering of interaction terms after sorting
fix up tests for formula.jl
Merge pull request #700 from kleinschmidt/dfk/formulas

improve formulas and revive tests
updating news
Merge pull request #702 from hunterowens/new-news

updating news
Replace braces by brackets in files of tests.
Replace braces by brackets in source files.
Alternative syntax for Dict construction acceptable to 0.3 and 0.4