Use single quotes for 'require' argument

Both single and double quotes are variously used for the 'require'
argument. Stick to single quotes for uniformity.
Clean up whitespace

Blocks of code are separated variously by one, two or three empty lines.
Stick to one empty line for uniformity.
Tweak documentation

Call the library "Reittiopas 2" instead of "Reittiopas2" because the
former looks better. Drop the boilerplate layout, and add a mention
of the license into the documentation.
Merge pull request #14 from jvirtanen/cleanups/documentation

Tweak documentation
Merge pull request #13 from jvirtanen/cleanups/whitespace

Clean up whitespace
Merge pull request #12 from jvirtanen/cleanups/imports

Use single quotes for 'require' argument