Add syntax highlighting, link examples, adjust formatting

Needed more pretty.
Merge pull request #119 from timoxley/patch-1

Add syntax highlighting, link examples, adjust formatting to the README.
Fixed borked example in Readme.

Using the example verbatim throws "Error: Invalid message id" in the suback. Please sanity check.
Merge pull request #120 from timoxley/patch-2

Fixed borked example in Readme.
Merge branch 'master' into v0.3.0-dev

Conflicts:
	README.md