CRAN v2.0

Added cran-comments to Rbuildignore

CRAN v1.19

Sadly making ftsa a dependency again to prevent revdep issues

v1.17

Fixed problem with mgcv

v1.16: Merge branch 'master' of https://github.com/robjhyndman/demography

* 'master' of https://github.com/robjhyndman/demography:
  v1.16

v1.15

Nearly finished v1.15