NP: fixed translation of NAs to 0 past year_beg and all the way up to year_max (for whole dataset) (ohi-science/ohicore#34)
need to redo area calculations and regenerate rgns from sp. realized while checking China's land and EEZ areas. #129
fix plyr/dplyr, added WRI-ReefsAtRisk for NP ohi-science/ohicore#34. plyr/dplyr in src/R/common.R#L22.
Merge pull request #47 from bbest/master

updated common.R to sequence loading of plyr/dplyr `summarize()`, added NP dataset