Added Timer::Stop(), Timer::Pause(), Timer::Resume() and Timer::Reset(), closes #27. Also added some helper functions like Timer::GetRemainingTime(). Added two unit tests to test the timer pausing/resuming, and test the start/stopping. Added a 'Provided OS Utilities' section to the README. Changed the use of 'configASSERT()' to use the 'MAssert' module instead, closes #17.