allowing create remote with custom fetch spec
adding doc for new param and test to check fetch spec is correctly added
splitting funcionality in two methods to avoid ambiguity with NULL
fixing typo
Merge pull request #1951 from victorgp/create-remote-plus-fetch

Allowing create remotes with custom fetch spec
Rename tests-clar to tests
Update files that reference tests-clar
Merge pull request #1962 from libgit2/rename-tests

Rename tests directory