test for exp, if not, no replace
suppress warn. date replace for yaml.
adding date_source info
added date.type arg, made call generic
simplifying calls w/ more in yaml
additional arg for load.sensor
minor text tweak
added new block for yaml
speed-up according to Rprof
avoiding pre-al for data.frames per speed
trying for speed-up. corrected err in cnt-1
killing line so build doesn't run it.
run clean data in ex.
Merge pull request #1 from jread-usgs/master

Speed-ups based on profiling biggest offenders