Cleaning some useless comments
Allow to search for images recursively in folder

Add from FileExchange the rdir function.
Dataset can now be generated from any types of files and look through
the folder and sub-folder if the option is given.
Read image metadata from Bio-Formats directly

Take advantage of the conversion of metadata to the OME standard is one
of Bio-Formats’ primary features. The OME metadata is always stored the
same way, regardless of input file format.
http://www.openmicroscopy.org/site/support/bio-formats5/developers/matlab-dev.html
Move rdir in lib folder
Fixed: pre-allocation of channel_name

channel_name was keeping the biggest size on each iteration. It results
in wrong name of channel, mainly copying TL Phase.
Possibility to filter a dataset based on keywords
Add segmentation of the phase contrast channel

@TODO: clean the code and add more comments