Release v0.2.0 - Githubissues

Part of #52

lagtimetc endpoint: computes Time of Concentration by the Lag Time Equation Method
traveltimetc endpoint: computes Time of Concentration by the Travel Time Method
weightedcurvenumber endpoint: calculates area-weighted or runoff-weighted curve number data (currently contains placeholder raw curve number data)
PRF endpoint: returns Peak Rate Factor data (currently returns placeholder PRF data)
scsyntheticunithydrograph endpoint: computes SC Synthetic Unit Hydrograph data
calculateMissingParametersSCSUH endpoint: combines rainfallDistributionCurve, PRFData, weightedCurveNumber, and travelTimeMethodTimeOfConcentration or lagTimeMethodTimeOfConcentration (depending on TcMethod) into single function

USGS-WiM / SC-RunoffModelingServices