Changes in 1.15.1
+ fix untarg import

Changes in 1.11.2
+ further vignette cache improvements

Changes in 1.11.1
+ use httptest to cache responses when building vignette

Changes in 1.1.1
+ bug fixes
+ added some helper functions

Changes in 1.0.0
+ Bioconductor release 3.12

Changes in 0.99.0
+ Bioconductor submission
