Print defaults for multiples

Check if the default value supplied is a slice and not nil, if so
print the list of values supplied.
Test case for slice argument with and without default values.
Default values for slices was not printed because slice is not
comparable, but the zero value for slices is nil.

[feature] GetHostTemplate and GetPathTemplate return the template used to build the route.

Change-Id: Ic6c776632587436d8b2a7810521f1a5ca1eae815

Additional fields (html_url, labels_url, id, closed_at) pulled from
https://developer.github.com/v3/issues/milestones/

Fixes #295

Fixes #297
Fixes #298

Change-Id: Ib17c43b368a0d0ee1a33690c17ad7c0f4dab55e5

Fixes #228
Fixes #301

Change-Id: I43d414332baa87b430487ea03d125633f8e40bd5

Change-Id: I385c22c290dd550c37ee7b3632a1a690cfaa36d7

Change-Id: I68a0d4fc72a4bd298298759ac70c0a2e8d83c00a

Defaults for multiples, intended behaviour

In V3 of the GitHub API, pull request comments are created in two ways. The
first way is to create a comment on a specific line of a file in a commit
with the following parameters:

| Name      | Type    | Description                                            |
|-----------|---------|--------------------------------------------------------|
| body      | string  | Required. The text of the comment                      |
| commit_id | string  | Required. The SHA of the commit to comment on.         |
| path      | string  | Required. The relative path of the file to comment on. |
| position  | integer | Required. The line index in the diff to comment on.    |

And the second way is through a reply to an existing comment with the following
parameters:

| Name        | Type    | Description                           |
|-------------|---------|---------------------------------------|
| body        | string  | Required. The text of the comment     |
| in_reply_to | integer | Required. The comment id to reply to. |

This commit adds support for the second (or "Alternative Input" according to
the GitHub docs) way.

This commit fixes a bug where if a multiple value argument (slice) has default
values, the submitted values will be appended to the default. Not
overriding them as expected.

[docs] Satisfied golint.

- SkipRouter should also be ErrRouterSkipped (or similar) but a change would break the public API.

- SkipRouter should also be ErrRouterSkipped (or similar) but a change would
  break the public API.

[docs] Add http://www.gorillatoolkit.org/pkg/mux to README.

[refactor] Only wrap regexp in group if not already in a group + perf. gains.

- Addresses https://github.com/gorilla/mux/issues/62
- ~27% less allocs/~15% speedup (ns/op)

[ci] Update .travis.yml to build Go 1.6

[ci] Update .travis.yml to build Go 1.6

make it possible to override the name of the program

Change-Id: Ia4888efa18c557a31af7093cfa449a67650afa20

Change-Id: I013dcbfb58ec10756c7b4e4bae6fe79b5e7c0062
Fixes #287

- simplify CLA text slightly
- clarify naming convention for .go files
- add "Maintainer's Guide" to document how I handle merging in
  contributions

fixes #283

Fixes #279.

Change-Id: I55ffdadfe5970d664ac94048e8bc2b8f5d935903

Fixes #152.

Add tests for RateLimitError.

Refactor populateRate into a more general parseRate.

Rate is now a method, not a field.

Mention RateLimits rather than RateLimit since the latter is deprecated.

Use Go convention for marking deprecated identifiers. See
257114af91.

fixes: #131,#271

Added urlquery middleware, resolves #174.

fixes #274