fix coefnames in table for an interaction

when the coef name for an interaction is reported using the coefnames function, it accidentally repeated the first variable in the interaction
Remove UTF32String usage
Change default show method to show all columns
push! row to DataFrame
push! row to DataFrame
do Base.push!
Merge pull request #621 from catawbasam/master

push!(df, row) for adding rows to a DataFrame
relax typing on Associatives
remove export 'vector' and 'matrix'
Merge pull request #624 from ssirai/patch

remove export 'vector' and 'matrix'
DataFrame(d::Dict) trying to access d(:key).
Merge pull request #622 from catawbasam/master

relax typing on Associatives
added sort to column names, added test.
added sort!(dames)
Switch to Base.tty_size
Merge pull request #629 from JuliaStats/jmw/tty

Switch to Base.tty_size
removed DataFrame(d::Dict) and deprecated with a call to convert(::DataFrame,d::Dict) - which is basically the constructor from before.
used depwarn() incorrectly. still breaks test/dataframe.jl? not sure how that relates to my changes...
added conversions to runrests.jl
Fix in-place associative methods so that they actually operate in-place

Previously empty! and insert! returned new DataFrames instead of
modifying their argument