Update README to tell specifically about Esprima-FB

* Added info on Esprima-FB with corresponding links to spec.
* Updated reference links to AST and tests pages.
* Added short explanation on versioning based on @zpao's comment: https://github.com/facebook/esprima/issues/35#issuecomment-52277629

Closes #40.
Support future regular expression flags

https://code.google.com/p/esprima/issues/detail?id=557
ES6 Module Syntax Sign-Off

* revision of ES6 import final grammar
* revision of ES6 export final grammar
* introduces `Syntax.ImportNamespaceSpecifier` for `import * as foo from "foo"`
* introduces `Syntax.ImportDefaultSpecifier` for `import foo from "foo";`
* introduces `ModuleSpecifier`
* left-hand side of comma in ImportDeclaration must be identifier
* right-hand side of comma in ImportDeclaration can be NameSpaceImport or NamedImports
* removes `kind=default` and `kind=named` from `ImportDeclaration` in favor of
  `Syntax.ImportDefaultSpecifier` form
* Removes `module {}` syntax
* moves all module tests into harmonymodulestest.js

https://code.google.com/p/esprima/issues/detail?id=597
Add few more tests to achieve module syntax full code coverage.

https://code.google.com/p/esprima/issues/detail?id=597
Ensure that harmony module tests are also included in the web tests.

https://code.google.com/p/esprima/issues/detail?id=597
Merge remote-tracking branch 'upstream/harmony' into fb-harmony

Conflicts:
	.gitignore
	esprima.js
	test/runner.js
7001.0001.0000-dev-harmony-fb
Update README.md
Merge pull request #53 from RReverser/patch-1

Update README to tell specifically about Esprima-FB
Add type annotations for ArrayPatterns and ObjectPatterns.
Added test with object type with no semicolon