Documentation improvements

[dmoranj]

• https://github.com/telefonicaid/iotagent-ul/blob/master/README.md: The apiary link is broken: https://github.com/telefonicaid/iotagent-ul/blob/master
• Links to the "Protocol section" are not working. Something seems to be broken with the "#protocol" anchor.
• The sentence "This transport protocol binding has not been implemented yet" is obsolete and should be removed.
• The sentence "This transport protocol binding is still under development" is obsolete and should be removed.
• Typos: "API Reference section;" -> "API Reference section.", "entity.T" -> "entity.", sepparated
• InstallationGuide: the order of sections Configuration-Packaging in IoTA-UL and IoTA-JSON are reversed. They should be homogeneous.

[jason-fox]

I believe this Issue was fixed with the amendment of the README.md into standard-readme format #301 @fgalan - what do you think? Should it be closed?

[fgalan]

Not fully sure... Some of the bullet list items are of that nature and I'd say they are solved. But for others I'm not sure.

A per item analisys should be done.