MOD: added project.R function

added project.R function to description and namespace files
ADD: as.kobe function

added as.kobe function that converts bdm object to kobe data frame
MOD: as.kobe for projections
ADD: added vignette

added vignette to illustrate compatibility of bdm package with kobe
Merge pull request #5 from cttedwards/kobe-function

Kobe function