Vadim Khotilovich b52db87d5c adding feature contributions to R and gblinear (#2295)
* [gblinear] add features contribution prediction; fix DumpModel bug

* [gbtree] minor changes to PredContrib

* [R] add feature contribution prediction to R

* [R] bump up version; update NEWS

* [gblinear] fix the base_margin issue; fixes #1969

* [R] list of matrices as output of multiclass feature contributions

* [gblinear] make order of DumpModel coefficients consistent: group index changes the fastest
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