Improve Base HTTP Request Mocking object.

Headers stored in fail tolerant dictionary, so no necessary handle
KeyError exception in the request processing method.
Rename post method in httpd test.
Implement jedi autocomplete request processing.

Add CompanyJedi class contains all remote API methods.
Implement candidates as it first method. 200 OK responses
passes for complete keys requests only.

Necessary request for now are command and args.
Add testing log formatter similar to default.