Commented Feature: Add .ToString() method in ExceptionHandler [2054]

To debug potential issues, implement a method printing all exceptions within a console and returning the value
Comments: Associated with changeset 35006: Version 0.9.0.2
- Updated Exception Management to throw Exception for invalid arguments. Consequently developers will be able to easily differentiate an exception caused by them (throwing) from an exception coming from twitter (returns null).
- Added TwitterException.ToString() to simplify debugging
- Added TwitterException.CreationDate
- Added ExceptionHandler.GetLifetimeExceptionDetails to get all the errors since the beginning of the application
- Added ExceptionHandler.WebExceptionReceived event to be notified of any TwitterException occurring
- Updated TwitterAccessor to throw Exception when query is invalid (instead of returning default)
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