Remove Eclipse metadata file

This file clashes with Eclipse when importing Bio-Formats via the
recommended "File > Import > Existing Maven Projects" mechanism.

Eclipse works after doing that, but it overwrites this .project file
with different contents, which makes Git always think there are local
changes, which affects rebase workflows.
merge dev_5_0 -D org -I include -E exclude: PR 921 (Final BF doc updates for 5 release)
merge dev_5_0 -D org -I include -E exclude: PR 931 (Update autogen scripts and templates for restructuring)
merge dev_5_0 -D org -I include -E exclude: PR 933 (Remove Eclipse metadata file)