Add using line to GLM example in README
Merge pull request #56 from simonster/sjk/param

Parametrize by array type instead of eltype
Reset state before refitting
Fix initial eta when an offset is specified

`updatemu!` adds `offset` to `eta`, so `offset` should be subtracted
from `eta` at the time of model construction. Otherwise the starting
parameters are wrong and it can take a very long time to reach
convergence.
Support Normal and Gamma distributions

This uses the moment estimator of scale parameter as in R and obtains
the same results. Because some of the tests (taken from R examples)
use an offset, they will fail to converge without #58.
Merge pull request #58 from simonster/sjk/fix-offset

Fix initial eta when an offset is specified.
Merge pull request #59 from simonster/sjk/gamma

Support Normal and Gamma distributions
Add missing dataset from 3ab944a3a440cae6092efdbcd95a61546681ee6e
Make sure that response variable is a float vector in lm
Merge pull request #63 from JuliaStats/anj/float

Make sure that response variable is a float vector in lm
Update for new NumericExtensions
Uncouple GLM from DataFrames

Requires JuliaStats/DataFrames.jl#571, JuliaStats/StatsBase.jl#51
Refs JuliaStats/Roadmap.jl#11