Add Matlab highlight to the Matlab developers page
Review the introductory section about bfopen output
Reformat headings and add internal link to OME metadata section
Fix colormap function case-sensitivity
Use relative links when describing the two metadata structures
Refactor the saving section using bfsave examples
Add example of direct usage of bfGetReader

- Also explicitly mention how to dump the OME-XML metadata into a string
Add Javadocs link to document the OME-XML metadata retrieval methods
Restructure Matlab documentation page

Split the bfopen section from the low-level bfGetReader/bfGetPlane section.
Include plane retrieval, image display and metadata reading as subsection of
the image opening section.
Replace seealso markup by a sentence for the OME metadata Javadoc link
Fix source link to bfopen function
Add link to MetadataStore and MetadataRetrieve interfaces Javadoc
Minor fixes as suggested by Melissa
Use double-quoted markup for series/plane variables
Minor fixes suggested by Helen
Merge pull request #666 from sbesson/matlab_dev_doc

Matlab developer documentation page update