Bump PHP version requirements.
Add namespaces to blocks.

Adding namespaces to every block is very useful for people that just want to resolve their particular issue (coming from a search, for instance), and didn't look at the start of the page for every bit of documentation; and it is more consistent now.

Also, removed an unnecessary Inflector call.
Merge pull request #1202 from bar/patch-2

Add namespaces to blocks.