Update POM version numbers to 5.0.6-SNAPSHOT
Update auto-generated documentation

Repository: openmicroscopy/bioformats
Already up-to-date.

Generated by BIOFORMATS-5.0-latest-docs-autogen#285 (http://ci.openmicroscopy.org/job/BIOFORMATS-5.0-latest-docs-autogen/285/)
Merge pull request #1354 from melissalinkert/5.0.6-snapshot

Update POM version numbers to 5.0.6-SNAPSHOT
Merge pull request #1355 from snoopycrimecop/dev_5_0/latest/autogen

Update auto-generated documentation
Adding external PR guidance to CONTRIBUTING.md
Merge pull request #1367 from hflynn/rebased/dev_5_0/external-prs

Adding external PR guidance to CONTRIBUTING.md (rebased onto dev_5_0)
Document usage of setSeries() and getIndex() in MATLAB documentation
Fix MIF spelling
Also mention IFormatReader.getIndex() in bfGetPlane()
Add missing space
Merge pull request #1372 from sbesson/rebased/dev_5_0/matlab_index

Document usage of setSeries() and getIndex() in MATLAB documentation (rebased onto dev_5_0)
Replace BigTiff sample link
Merge pull request #1380 from hflynn/rebased/dev_5_0/tiff-link

Replace BigTiff sample link (rebased onto dev_5_0)
Update version numbers to 5.0.6
Fix Analyze 7.5 specification link
Merge pull request #1392 from hflynn/rebased/dev_5_0/analyze7-5

Fix Analyze 7.5 specification link (rebased onto dev_5_0)
ND2: reset series count before allocating offset array

This prevents extra memory from being used if the series count was too
high.  See http://lists.openmicroscopy.org.uk/pipermail/ome-users/2014-September/004699.html
Leica LIF: fix support for new files with 0 padding

Fixes #12144
Zeiss CZI: fix dimension calculations when expected planes are missing

See #12556.
Zeiss CZI: make sure pixel buffer is cleared

This prevents blank planes from containing garbage data.