Separate the Git executable path from the arguments
Revert "make use of library request.el"

This reverts commit a9457ae1ca6f29d7deaa148cd423c469d68a7ebc.

There are some more kinks to be worked out for proper
integration with request.el.

Fixes #25
Merge pull request #26 from mgalgs/revert-request.el

Revert "make use of library request.el"
Merge pull request #22 from dgutov/patch-1

Separate the Git executable path from the arguments