Add PHP to supported Language Map

[grantlucas]

I have an API that can be used by a variety of languages and it doesn't seem that I can specify PHP as a language. I believe this change will allow that?

As mentioned in Issue #18, it'd be nice to be able to specify a Widdershins config file instead to configure it instead of having to use api2html params.

[tobilg]

Thanks for the PR. I just released version 0.3.1 of this package.

[abelhegedus]

There's a missing " after "php which causes build failures with 0.3.1

/node_modules/api2html/bin/api2html.js:23
00:00:57.282 "php: "PHP"
00:00:57.282 ^^^
00:00:57.282 00:00:57.282 SyntaxError: Unexpected identifier
00:00:57.282 at new Script (vm.js:74:7)
00:00:57.282 at createScript (vm.js:246:10)
00:00:57.282 at Object.runInThisContext (vm.js:298:10)
00:00:57.282 at Module._compile (internal/modules/cjs/loader.js:670:28)
00:00:57.282 at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
00:00:57.282 at Module.load (internal/modules/cjs/loader.js:612:32)
00:00:57.282 at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
00:00:57.282 at Function.Module._load (internal/modules/cjs/loader.js:543:3)
00:00:57.282 at Function.Module.runMain (internal/modules/cjs/loader.js:744:10)
00:00:57.282 at startup (internal/bootstrap/node.js:238:19)

[grantlucas]

This should be resolved when PR #20 is merged