Enable anyconfig to handle yaml merge syntax properly

[idanov]

Fix anyconfig's yaml backend to handle yaml merge syntax and address #87

[coveralls]

Coverage increased (+0.005%) to 92.628% when pulling a24d4b3 on idanov:master into c71c0c5 on ssato:master.

[ssato]

Thanks a lot! I was not aware of the issue at all. LGTM and merged.

[idanov]

Thanks for merging it! I even didn't know about this feature in YAML until we needed it in a project :) Do you plan to release a new version to PyPI soon which will include the change?

[ssato]

Do you plan to release a new version to PyPI soon which will include the change?
I'm planning to release it soon if I could stabilize pathlib support and others new functions including this. Please wait for a while.