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Added autoplot.ace_conditions and autoplot.ace_station to create plots using ggplot2

acewater 0.4.0 (2017-06-09)

Added stations for all Seattle District projects: Chehalis River Basin, Eastern Washington Rivers, Flathead and Clark Fork Rivers, Green River Basin, Kootenai River Basin, Pend Oreille River Basin, Puyallup River Basin, and Skagit River Basin
Updated ace_station structure
- Added data_units field to ace_station for measurement units
- Added project field to ace_station to store station's project
- Added info_url field for adding links to external information
- Added latitude and longitude fields for mapping purposes [#5]
Added ace_project structure for storing projects (each has multiple stations)
Added find_project function to find the project (code) associated with a given monitoring station
get_station now takes a project code as argument
Updated get_water_conditions
- get_water_conditions.character now takes a project code as argument
- Project/basin now included in result tibble
- Additional attributres like project/station name and retrieval time added [#6]
- Added ace_conditions class to allow for future options like plot.ace_conditions
Removed station_name function
Internal data updates
- Added values for data_units and project to existing stations
- Added ace_projects data set, containing information about different basins/projects
- Removed ace_stations (after renaming it from stations)
- File moved to ace_projects
README updates
- Added Grand Coulee Dam example
- Updated examples in README to include project codes

Now works with all stations in the Lake Washington Ship Canal
get_water_conditions can now work with more types of measurements (just using the data_columns names)
get_water_conditions now returns Station code as a factor
Added more stations to stations data set: BTHS, FISH2, KNMR, RNTW
Added data_skiprows attribute to ace_station to specify number of rows to skip at the beginning of the file

Added ace_station constructor
- stations data is now a list of ace_station objects
- get_station now returns object from station data, no longer constructing an object itself
- get_water_conditions now works with ace_station objects
get_water_conditions now a generic function
- Supports for specifying station as character vector (e.g. "FBLW") or ace_station object

get_water_conditions now takes station code instead of station object
Station data now includes information about columns in result, which will make it easy to accomodate more station data formats
Station data can now include a url in case a station's url doesn't follow the usual scheme
Moved station data for stations.R to data-raw/data_stations.R
Station data are know stored as package data (stations)
get_station now returns an ace_station object
Added station_name helper function
Added basic unit testing framework