MDL-41664 - Calendar: Add method for formating years in the new calendar plugin.
MDL-41664 core_calendar: replaced class variables that stored minimum and maximum years with functions

Also made slight changes to the existing functions.
MDL-42589: Fix file picker display in ie9/ie10

CSS change to fix blank file picker bug in IE.
Merge branch 'MDL-41664_master' of https://github.com/markn86/moodle
Merge branch 'MDL-42589-master' of git://github.com/damyon/moodle
MDL-33046 repository_boxnet: Convert repository to APIv2
MDL-33046 repository_boxnet: System to convert APIv1 references to true copies