Fix documentation warnings

[fredhdroz]

The current documentation display warnings due to bad param names

For example :

 * Initialize the chartbeat tracker library. The tracker will not start until you call trackView
 *
 * @param uid Your chartbeat account id
 * @param domain The domain name to report to.
 */
- (BOOL)setupTrackerWithAccountId:(int)uid_ domain:(NSString *)domain;

the param "uid" does not exists in the method, the documentation should refer to "uid_" instead

this should be fixed for all methods.