add link to earthpy.org notebook; closes #48
make install docs clearer
change Quick start wording
add updates to cpc.drought module to changelog
pep8
clean up date normalization
add twc.kbdi module to docs
order api docs by alpha
add twc.kdbi to changelog and README
order readme datasets by alpha
move CPC to supported datasets in README
add usace.swtwc to README
add ncdc.cirs to "coming soon" in README
use compression settings when running (pt)repack
change default compression level: 1 -> 9
don't filter performance warnings
explicitly recast uses_dst back to bool dtype
avoid performance warning and is more efficient all around