Remove debugging code.
[#2260125] andyg5000 - Abstract API initialization into it's own function for better reusability.
Use drupal_realpath() to get full path to log file when initializaing the kissmetrics client with delayed transport.
[#2378529] interactivejunky - Allow events to be identified as a user other than the currently logged in user.

- Creates a better API for use in scenarios where you want to record
  information about other users.
[#2367151] Sweetchuck - Don't overwrite other JS added to page_top region when adding the kissmetrics JS.
[#2209837] andyg5000, bonus - Allow other modules to alter the KM unique ID used to identify a user.

- Introduces hook_kissmetrics_id_alter() and documentation.