Simple annotation support for setting background colorings to days e.g. to present business hours or some other info.
Rest of the annotation related changes that I forgot to commit in the first batch.
Fixed styles a bit so that different backgrounds can affect how annotation looks like (e.g. current day has yellow background)
Small changes to make example more clear
Fixed few errors caused building to fail
Fixed selection offset problem
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Added expiredDate-render method. fixes #1
Added option to enable/disable expiredDays-rendering
fixed problem with greyed day in day view
updated readme