Merge branch 'develop' of git://github.com/openmicroscopy/bioformats into spec2013
Revert "Change Magnification type to float"

This reverts commit b89dae7a0d7612da48a80e5f0e8b919df53c0e78.

This will need reapplied when we move to the new 2013-06 schema.
doc/sphinx/formats: Add "schema" extlink
Getting test to run, they still fail
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 424 (Specification changes for 2013-06 release)
merge develop -D org -I include -E exclude: PR 435 (Fixes for March 2013 bug week (rebased onto develop))
merge develop -D org -I include -E exclude: PR 438 (Fix the autogenerated metadata field counts (rebased onto develop))
merge develop -D org -I include -E exclude: PR 447 (Add "schema" extlink (develop))