Resets version number and release note (after yesterday release of 1.2).
Adds the AsyncRelatedTests fixture with a single test illustrating https://github.com/tpierrain/NFluent/issues/112 (ignored for the moment)

Migrates NFluent from .NET 4.0 to .NET 4.5 to prepare the compliance with Async/Await concept.
Introduces comments to exclude MS tests integration stuff from NCrunch coverage (see within ExceptionHelper type) which restores test coverage to 100%.
Temporary fixes a NCrunch issue with conditional compilation symbols (here: dotNet45) : http://forum.ncrunch.net/yaf_postst935_Issue-when-using-conditional-compilation-symbols-in-linked-file.aspx
Workarounds a NCrunch issue when using conditional compilation symbols (http://forum.ncrunch.net/yaf_postst935_Issue-when-using-conditional-compilation-symbols-in-linked-file.aspx) by forcing the DOTNET_45 symbol for all possible configurations of NFluent.40 and NFluent.40.Tests projects.

The issue was that none of the code or test depending on this conditional compilation symbol was taken into account by NCrunch.

Note: that one was painful to troubleshoot and to fix.
Renames NFluent.40.* folders to NFluent.45.*
Updates build script to be able to target .NET 4.5 instead of .NET 4.0.
First and naive implementation of Check.ThatAsyncCode() + tests (still failing so far).
Fixes some comments.
Replaces the InvalidOperationException by a SecurityException. InvalidOperationException was hidding the failure of one test.
Here comes the green for the AsyncRelatedTests. Next step: refactor ;-)
Fixes all AsyncRelatedTests, reorders them for a better readability, adds some comments with questions for reviewers

Fixes all stylecheck issues.
Improves unit test comment.
Improves release note.
Renames IsSetBefore into IsSetWithin, to follow comments from https://github.com/tpierrain/NFluent/issues/107
Updates the release note to include Cyrille's bug fix.

Improves the UserReportedIssuesTests.SpuriousExceptionOnError() test by indicating the Expected error message.
Fixes Cyrille's pull request StyleCop issues (including usage of tabs instead of spaces).
Makes TimeUnit as mandatory parameter for EventWaitHandle checks.
Introduces a Duration.ConvertToMilliseconds static method.
Moves duration checks into the new Duration tests fixture, and replaces previous NUnit Assertions with Checks for it.
Updates the backlog file.