Document latest changes to the Homebrew OMERO formula

- Ice (3.5) is now the default version installed by `brew install omero`
- Add options to use old 3.3 and 3.4 versions
- Update PYTHONPATH setting in the configuration section
Add note about SLICEPATH for development server
Add note about .bash_profile
Merge pull request #639 from sbesson/rebased/develop/homebrew_4410

Document latest changes to the Homebrew OMERO formula (rebased onto develop)
Updating Till Photonics website link
Merge pull request #643 from hflynn/till-photonics

Updating Till Photonics website link
Add --devel option to install the OMERO 5 via Homebrew
Drop --use-mirrors from .travis.yml
Merge pull request #649 from sbesson/rebased/develop/travis_pypi

Drop --use-mirrors from .travis.yml (rebased onto develop)
Add documentation for the OMERO MATLAB jobs
Add documentation for the Bio-Formats MATLAB jobs
Merge pull request #645 from sbesson/rebased/develop/omero5_homebrew_devel

Add --devel option to install the OMERO 5 via Homebrew (rebased onto develop)
Use proper markup for configuration properties and files
Create see also references to the Grid configuration section
Add section about application description, server instances and templates
Fix headings hierarchy and capitalize OMERO
Add paragraph about server-template memory settings
Address various comments made by Mark and Roger
Fix erroneously introduced whitespace
Move JVM memory settings section to the server installation page

As we expect all the sysadmins to read this particular section, the JVM memory
settings section is now directly included into the Server Installation
sections for UNIX and Windows platforms. The link to the advanced server
configuration section is preserved for informative purposes only alongside
with the link to the forum thread.