fixed issue #49.
enable test
refactor IID metadata code
add command-line option to collect metadata
fix top-level tests, add a new test
fixed issue #49 (secondary)
fixed another issue related to #49
removed unnecessary console.log
enable test
temporarily pull in a different version of rewriting-proxy

This is caused by breakage in the latest version of the html5
package.
switch back to npm version of rewriting-proxy, which works now
added a test
fixed bug that showed up due to JSON's behavior on NaN and Infinity
Merge branch 'master' of https://github.com/SRA-SiliconValley/jalangi
Merge branch 'master' into issue43-2

Conflicts:
	tests/unit/proto_prop_lookup.js
added the test for JSON_nan_bug
Merge branch 'master' into issue43-2