Implement php-send-region

The provides a command, php-send-region, which sends a selected region
of code to PHP for execution.  The command displays the results in a
buffer named *PHP*.  The key-binding ‘C-c C-r’ will run the command.
Update php-mode-modified date and the copyright date for 2012
Document php-send-region in the README
Merge branch 'send-code-to-php'

* send-code-to-php:
  Document php-send-region in the README
  Update php-mode-modified date and the copyright date for 2012
  Implement php-send-region
Bump php-mode-version-number to 1.6.5

I meant to do this when implementing ‘php-send-region’ but it just
slipped my mind.  The version number needs an increase since I request
the version number in bug reports, and this will help potentially
narrow down bugs to any changes introduced by ‘php-send-region’.
Include a link to the GPL in the README for easier access
Improve argument indentation within nested functions

Currently indenting arguments in nested functions looks like so:

    $x = do_something(array(
                          'foo' => 'bar',
                          'baz' => 20
                          ));

(Yes, technically array() is not a function but a language construct.
But that distinction does not matter for our purposes.)

A more readable way to indent the arguments appeared in code posted
here on the Emacs Wiki:

    http://emacswiki.org/emacs/PhpMode#toc16

Which changes the above to look like this:

    $x = do_something(array(
             'foo' => 'bar',
             'baz' => 20
         ));

This patch copies that code, albeit with small modifications: removing
the prefix ‘ywb-’ from the functions.  This is not to slight the
original author, but to maintain some consistency in the namespace of
definitions within php-mode.  Implied in my previous statement is that
I am not the person who came up with this code.  My apologies for not
knowing who ‘ywb’ is, but he deserves proper credit for this
modification.
Set not fontified word to font-lock-constant-face face.

Warnning face can be generated by flymake, so consider these words as user defined constant.
Merge https://github.com/shanderlam/php-mode into integration

Conflicts:
	php-mode.el
Add die to the list of language constructs
Add two missing core constants
Merge pull request #17 from flack/master

Add "die" to list of language constructs
Add notes for how to contribute to php-mode

These are some simple suggestions that I feel will make things a
little smoother.  Particularly having contributors add themselves to
the README so that I don’t forget to give anyone due credit.
Update the status of php-mode in the README
Fix a typo in the README regarding ‘Contributors’
Add notes about pull requests and emailing patches for contributors
Ask contributors not to change php-mode-version-number
Add Maël Nison to the list of contributors

Whoops, this was a long time coming after his patch from March.  My
apologies for letting that update slip by.
Merge branch 'ejmr/contributing-docs'

* ejmr/contributing-docs:
  Add Maël Nison to the list of contributors
  Ask contributors not to change php-mode-version-number
  Add notes about pull requests and emailing patches for contributors
  Fix a typo in the README regarding ‘Contributors’
  Update the status of php-mode in the README
  Add notes for how to contribute to php-mode
Allow commas in namespace imports

Currently php-mode does not properly fontify code like

    use ReflectionMethod, ReflectionObject;

This patch corrects that.

Github-issue: 16