MSBuild runner now uses latest MSBuild version if not explicitly specified. Closes #27.
Tweaked links in readme.

Corrected milestones link.
Changes wiki to Documentation link, since wiki currently just points to
the documentation.
Merge pull request #90 from RichiCoder1/documentation/Readme_Update_Milestone_Wiki

Tweaked links in ReadMe.
Moved Tool<T> to Cake.Core. Closes #91.
Fix for reporting exceptions.
Ignored errors are now logged.
Expanded NUnit Settings.

Added Results File, Framework, Include, Exclude, Timeout, NoThread,
NoLogo, StopOnError, and Trace options.

Added NoResults and slightly expanded tests.
Merge pull request #87 from RichiCoder1/feature/Expand_NUnit_Settings

Expanded NUnit Settings.