Fix broken link to ImgOpener.java (using Github link)
Merge pull request #437 from sbesson/rebased/develop/img2lib_link_fix

Fix broken link to ImgOpener.java (using Github link) (rebased onto develop)
merge develop -D org -I include -E exclude: PR 159 (Improve .ndpi support)
merge develop -D org -I include -E exclude: PR 351 (Add SPW support to FakeReader)
merge develop -D org -I include -E exclude: PR 421 (Documentation for new Imspector format)
merge develop -D org -I include -E exclude: PR 424 (Specification changes for 2013-06 release)
merge develop -D org -I include -E exclude: PR 433 (More .nd2 fixes (rebased onto develop))