Plspm

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* Include non-metric plspm in Vignette

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* Fixed typos in vignette

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* re-submission addressing package's Description change requested by Kurt Hornick
* changed package URL in DESCRIPTION
* addes BugReports in DESCRIPTION
* updated call to plot diagrams: `diagram::plotmat`
* updated vignette with all plots displayed
* fixed bug in rebus.pls example documentation

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* updated documentation in funciton `plspm` for non-metric argument scaling
* updated `install_github` call in README

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* fixed bug in 'get_boots' so now repeated names of MVs in constructs of 2nd order are displayed when requiring bootstrapping

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* change package dependencies and Import options, in order to comply with CRAN Policies