[NFR] Add support for creating classes/methods with capitalized names

[sergeyklay]

From @tamaranga on February 1, 2014 9:39

It's impossible to create class:

class HTML {
}

and method:

class Test {
      public function HTML() {}
}

Maybe it is not so difficult to allow such capitalized names or describe this limitation in docs. Currently it's just "ParseException: Syntax error", that is not very obvious.

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Copied from original issue: zephir-lang/zephir#141

[sergeyklay]

From @nazar-pc on December 2, 2014 4:20

I'm also wondering about this, just wanted to create such class.
What is the actual limitation for this?