Add writing of .v3draw format for easy loading with Vaa3D.

Vaa3D (http://vaa3d.org ) is an open-source program for 3D
visualization and analysis of bioimage datasets.  .v3draw is a
minimalist format designed for rapid writing and reading with Vaa3D,
currently supported by Fiji for reading and writing.  This commit
provides .v3draw writing capability for bioformats.
Correct issues brought up by @melissalinkert

See pull request for content. Most substantive change: V3DrawWriter
class now takes endianness of file from metadata and writes the .v3draw
file  with the same byte order as the input.
Specify encoding when working with strings

This fixes warnings reported by Findbugs in
http://ci.openmicroscopy.org/view/Failing/job/BIOFORMATS-5.1-merge-build/352
Merge pull request #1 from melissalinkert/findbugs-fix

Specify encoding when working with strings
Merge pull request #978 from berl/develop

Add writing of .v3draw format for easy loading with Vaa3D.