Add a JSON string template filter

[Benjamin Smedberg]

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Benjamin Smedberg wrote:

| I have a patch attached which adds a "jsonescape" template filter which is

Per IRC discussion, I've added a unit test, updated patch is at
http://hg.mozilla.org/users/bsmedberg_mozilla.com/mercurial-crew-patches/?file/91c6209f24e7/jsonescape

- --BDS

- --

Benjamin Smedberg
Platform Guru
Mozilla Corporation
benjamin at smedbergs.us
http://benjamin.smedbergs.us/
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