travis: Build with OpenJDK8
Fixing & adding links to contributing devs docs
merge develop -D org -I include -E exclude: PR 528 (Tile performance improvements for VMS and NDPI)
merge develop -D org -I include -E exclude: PR 767 (Fix Channel.Color interpretation in ImageJ)
merge develop -D org -I include -E exclude: PR 775 (Add JWlz to Ivy dependencies)
merge develop -D org -I include -E exclude: PR 783 (Leica LIF: do not set the 'rgb' flag for 16-bit multi-channel data)
merge develop -D org -I include -E exclude: PR 788 (Do not prompt to update to the latest stable version if Fiji is used)
merge develop -D org -I include -E exclude: PR 790 (Update netCDF to 4.3.19)
merge develop -D org -I include -E exclude: PR 791 (Add support for PCORAW data)
merge develop -D org -I include -E exclude: PR 792 (Metamorph: make certain that the reader is closed when openBytes returns (rebased onto develop))
merge develop -D org -I include -E exclude: PR 796 (Zip: improve reader and handle performance)
merge develop -D org -I include -E exclude: PR 797 (Zeiss CZI: fix image reading for linescan images)
merge develop -D org -I include -E exclude: PR 798 (travis: Build with OpenJDK8)
merge develop -D org -I include -E exclude: PR 799 (Fixing & adding links to contributing devs docs)