Use POST requests when contacting the telegram api server.

[jonnywilliamson]

Whilst a GET request according to the specs may have an unlimited number of characters, in practice it appears that different versions of PHP and even webbrowsers do have a limit.

http://stackoverflow.com/questions/3091485/what-is-the-limit-on-querystring-get-url-parameters
http://stackoverflow.com/questions/812925/what-is-the-maximum-possible-length-of-a-query-string
http://stackoverflow.com/questions/7724270/max-size-of-url-parameters-in-get

This means that if we have a very long message etc and try to use a GET request, the request will likely be corrupt.

We can bypass this limitation by using a POST request.

Telegram supports four ways of passing parameters, but the most useful are:

application/x-www-form-urlencoded
multipart/form-data (use to upload files)

This PR, switches the normal requests to use POST instead of GET and ensure the parameters are passed via application/x-www-form-urlencoded

If a file is being uploaded, it automatically knows to use multipart/form-data.

No breaking changes.

[irazasyed]

Thank you @jonnywilliamson :)

[jonnywilliamson]

@irazasyed No probs!

Any chance of a tag release?

[irazasyed]

Will do that sometime this week. Gotta do some testing of all the recent changes.