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Make pcntl recommended, but not *required*.
Mac OS X's default PHP install does not include pcntl.
Let's make this optional, so people don't have to recompile PHP
just to use phpsh. This commit lets us use the benefits of pcntl
if we have it, but doesn't force us to have it.
Added documentation for the PHP requirements.
Convert readme file to Markdown.
Convert the readme file to Markdown.
Add the easy_install commands for python deps.
[This is a pull from github]