enhancement for issue #38 (DateTime in df)
new function `get_metrics` for #40
new version w/ get_metrics and CI
library for functions ls()
update w/ install external dep binary
test for build kick-off
test for build kick-off
test for build kick-off
test for build kick-off
test for build kick-off
test for build kick-off
global build args
--no-multiarch on INSTALL
--no-multiarch for check and install
install_github GLEON/rLakeAnalyzer 

to get center.buoyancy function (not in CRAN version)
R_INSTALL_ARGS
R CMD INSTALL ${FILE} ${R_INSTALL_ARGS}
Merge pull request #53 from jread-usgs/master

adding get_metrics and CI for builds