Conforming to drupal coding standards

There are a few aspects of the code in this module that don't adhere to drupal
coding standards (http://drupal.org/coding-standards).

Things like indenting with two spaces instead of tabs, using uppercase for constants
like TRUE, FALSE & NULL, closing array brackets being indented, using curly braces
with control statements even if they are only one line and comments being on the
line immediately before the next line of code.

It might seem petty but it is much easier if code adheres to these standards.
It is also important in this case because you intend the module to be used as an API,
so people will be reading and reusing your code to make modules that use the API.