* Allow both both hoidays and append holidays
Match holidays in predict and fit
Add test for append_holiday features; minor fixes
Add column name validation for append_holidays names; allow only one country
Fix bug about holiday year different from input year and also other bugs
Change function description
Add append holiday feature for R
* Add test for R/Pyrhon; fix bugs
* Add metrics for model validation
* Update to reflect comments on Github
* Change all_metrics() implementation to more sophisticated style
* Update metrics functions
* Remove redundant argument
* Use v0.3 files for diagnostics.R and prophet.R
* Use v0.3 file for man/predict.prophet.Rd
* Change the interface and do some refactoring
* Update memory requirement description per #326
* Fix R warning with extra regressor; disallow constant extra regressors.
* Fix unit test broken in new pandas
* Fix diagnostics unit tests for new pandas
* Fix copy with extra seasonalities / regressors Py
* Fix copy with extra seasonalities / regressors R
* Fix weekly_start and yearly_start in R plot_components
* Fix plotting in pandas 0.21 by using pydatetime instead of numpy
* Version bump
* Update README for new version
* Fix missing columns in SHF with extra regressor
* efficiency improvements in r package
* add drop = FALSE to df subsetting
* adding two more drop = FALSE
* add back in global var vector
* revert to previous style of piecewise_linear, piecewise_logistic
* more reversion
* even more reversion
* revert get_changepoint_matrix
* trying to pinpoint issues
* more debugginh
* tests finally pass
* last commit of pr
* last commit of pr
* add utils to imports
