Capitalize MATLAB across the page
Add top-level link to the Training examples
Explicit the requirements for an unsecure client

To be able to create an unsecure client, a valid session needs to be instantiated first
Add quick description of some of the option when retrieving annotations

Descripe include, exclude and owner parameter/key values
Implement Helen's rewording suggestion
Merge pull request #745 from sbesson/rebased/develop/matlab_improvements

OMERO.matlab improvements (rebased onto develop)