bug fixes and async to call of Start method

Fixed bugs and allowed Start method to be called asynchronously if so desired by user

Major bug fixes

Improved ticker initialization logic
Improved shutdown handling
Removed redundant close method
Removed error returned by Close method since its always nil
Removed potential deadlock in for-select

Ctrl-C Removed

Bug fix: removed signal termination as it interferes with production code

Bug fixes and cleaner code

Fixed bugs in timer logic and cleaned out the code.
Enjoy