CC0122 Replace Task.Result with await Task

[AmadeusW]

Fixes #734
CC0122 Replace Task.Result with await Task

Adds Design Warning CC0122 when System.Threading.Tasks.Task<TResult>.Result is used in async method.
The code fix provider replaces .Result with async

Screenshot of a non trivial case:

[coveralls]

Coverage increased (+0.03%) to 90.925% when pulling d0cd1fd on AmadeusW:0122 into 38b630a on code-cracker:vnext.

[giggio]

@AmadeusW You have some problem with your commits, you probably merged from CodeCracker's master into your branch, or something else. You can see that on the Commit tab here at github, it shows 12 commits and 35 changed files.
Also, you should change the pull to branch master, not vnext.

[giggio]

Taking a look at the commits, what you should do is:

• Update your master branch, according to CodeCracker's master branch git checkout master, then git pull https://github.com/code-cracker/code-cracker.git master.
• Create a new branch git checkout -b newbranch
• Cherry pick your commits into it git cherry-pick 91e3e6d4fa05ea002c1844ab2665a00d0f8ca18c and git cherry-pick 23ebf1b89136cee55fd48caa48c0949dce0cd848.

Then open the PR with this branch, and close this one.

[AmadeusW]

Thanks @giggio, I'm closing this in favor of #820