Add Logger.Swallow(Task task)

[breyed]

fixes #1231.

[304NotModified]

Thanks!

[codecov-io]

Current coverage is 74.43%

Merging #1245 into master will decrease coverage by -0.01% as of 6496ba4

@@            master   #1245   diff @@
======================================
  Files          267     267       
  Stmts        15383   15392     +9
  Branches      1613    1614     +1
  Methods          0       0       
======================================
+ Hit          11452   11457     +5
  Partial        381     381       
- Missed        3550    3554     +4

Review entire Coverage Diff as of 6496ba4

---

Uncovered Suggestions

1. +0.09% via ...gingConfiguration.cs#282...295
2. +0.09% via ...gingConfiguration.cs#248...261
3. +0.08% via ...argets/FileTarget.cs#1704...1716
4. See 7 more...

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