v1.2.1: Merge pull request #17 from mjt320/develop

add Georgiou AIF

v1.1.1: Merge pull request #16 from mjt320/develop

*roi_measure* exclude NaNs when calculating percentiles

v1.1.0: Merge pull request #15 from mjt320/develop

roi_measure modified to generate more ROI statistics

v1.0.3: Merge pull request #14 from mjt320/develop

handle more negative inputs

v1.0.2

Update README.md

v1.0.1: Merge pull request #11 from mjt320/develop

modify AIF interpolation method