Added auto-redirect control param on HTTP methods

Additional parameter allow_redirect has been added to GET, PUT, POST,
PATCH, DELETE, OPTIONS and HEAD methods. Warning: default behavior for
HEAD method is allow_redirect=False.

Due to httpbin.org website limitations, no test cases have been
written for PATCH and DELETE methods, and the OPTIONS method is
tested with allow_redirect=True only.
Merge pull request #43 from ybilik/master

Added auto-redirect control param on HTTP methods