Plspm

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* fixed factorial scheme bug in `get_weights_nonmetric`
* get_dummy allows `x` to include zero

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* fixing a bug for non-metric data in `get_boots`

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NEW FEATURES

* Full redesigning of the popular plspm package that now provides
all the cool features for handling non-metric data.

* argument `maxiter` replaces `iter`

* new argument `scaling` to handle non-metric variables

* term `path_matrix` replaces `inner_matrix`

* term `blocks` replaces `outer_list`. Moreover, now you can
specify blocks using character strings

* `inner_model` gives the full set of coefficients results from 'lm'

* Simplified output of `plspm()` containing data frames compatible with ggplot2

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* fixing a typo in `print.plspm` (thanks to Jeff Daniels)

* Decreasing required R version to 2.14.0 (suggested by Mikko Ronkko)

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* `innerplot` allows parameter arr.lwd to be expressed as a matrix;
this can be used to plot arrows with different line widths

* fixing a typo in `innerplot.Rd`

* fixing a typo in `outerplot.Rd`

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* changing print format of `print.local.models`

* fixing a typo in `futbol.Rd`