Merge pull request #8 from cgries/master

removed powellStream dependency
remove powstreams
Merge branch 'master' of github.com:USGS-R/mda.streams
adding get_sites()
Removed get_ids because @jread-USGS already made it
Merge pull request #9 from jread-usgs/master

get_sites()
Merge branch 'master' of github.com:USGS-R/mda.streams
Merge pull request #10 from lawinslow/master

Removed my duplicate function
Added initial version of post_ts
Merge pull request #11 from lawinslow/master

Added initial version of post_ts