load Chave CWD and E values for ForestGEO sites

@gonzalezeb @ValentineHerr @beckybanbury,

I know we've extracted the CWD and E values for ForestGEO sites, but I'm not sure where we have them. (I've found a couple copies of E, but I'm looking for CWD at the moment.) Could one of you please point me to them and/or load them here (under gridded data products)? 