Add info about "mobile" and "tablet" detectors.
Merge pull request #1175 from ADmad/3.0-request-detector

Add info about "mobile" and "tablet" detectors.
General edits to part one of the blog tut
Fix grammar in blog tut
Merge pull request #1181 from bcrowe/3.0-blog-general

3.0 - General edits to part one of the blog tut
Remove scaffolding references, update PHP version
Merge pull request #1182 from bcrowe/3.0-rm-scaffold

3.0 - Remove scaffolding references, update PHP version