More initialism corrections (golint)

[anthonyfok]

Deal with Url -> URL and BaseUrl -> BaseURL conversion
while preserving backward compatibility, and marking
relevant lines deprecated.

Also fix related initialisms in strings and comments.

Continued effort in fixing #959.

[bep]

See 6e30c10

To communicate these changes to the users, I think it is better to create temporary methods on the structs for the renamed fields and methods, like this:

// Url is deprecated. Will be removed in 0.15.
func (p *pager) Url() template.HTML {
    helpers.Deprecated("Paginator", "Url", "URL")
    return p.URL()
}

[anthonyfok]

@bep Thank you for authoring helpers.Deprecated() and showing me how to use it. It has been a great learning experience!

I need to leave the house in an hour though. I hope to find time tonight (12 hours from now?) to study and incorporate your example to deprecated struct fields. :-)

[bep]

No rush. Note that, from the template's point of view, a method will look (almost) like a field, so the above should work for both cases.

[anthonyfok]

Hi @bep!

You are brilliant! And so is your helpers.Deprecated() function! It is such a joy to use! It makes the transition so much cleaner too!

I have just pushed 92ae298; please check and see if it is OK.

I will update the docs soon. :-)

Thanks again!

[bep]

Merged. Quality work!

I may be a person who thinks this is more important than the average developer Joe, but if you don't pull the tech debt by the horns, you get a legacy system pretty fast.

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