(Bug 2687) Remove JSON 1.0 module

Remove JSON module override, use the version installed on the machine
(2.53 or thereabouts)

Also adjust tests:
* 123 used as string is now recognized as "123" by jquery library
* add number ending in a dot to the tests
(Bug 2687) Move from JSON::objToJson -> to_json
(Bug 2687) JSON::jsonToObj -> from_json

Also removes $JSON::UnMapping; the module does this by default, as it
should.
(Bug 2687) Get rid of json2.js
(Bug 2687) Update checkconfig for JSON module
(Bug 2687) Add a wrapper around JSON to handle text encoding

Original LJ::JSON module by ailyin at LiveJournal. Some modifications
made to the API so that it matches behavior of the JSON module for
to_json and from_json.

Also add test with non-ASCII text
Merge pull request #270 from afuna/update-json-bug2687

(Bug 2687) Update JSON module * remove old module (relying on server-installed module now) * update API -- use to_json / from_json instead of objToJson /   jsonToObj, which are obsolete * import the JSON wrapper module from LiveJournal, to handle encoding