Implement LocationMarker object type.

This is the master-branch patch analogous to #185, which applies to
the harmony branch.

https://code.google.com/p/esprima/issues/detail?id=429
AMD test: Do not load via script tag explicitly.

The loading of Esprima should be handled by RequireJS.

http://code.google.com/p/esprima/issues/detail?id=291
'commit'
Update README.md
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Update README.md
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fixes on parser demos
handle unnamed package definition
fix demos