Patch from Scott McKellar:

Patch from Scott McKellar:

This patch plugs a memory leak that I somehow missed earlier, and
adds a few performance tweaks.

1. In osrfRouterFree() I added a line to free the osrfHash to which
the classes member points.

2. I replaced an occurrence of "jsonParseString("[]")" with
"jsonNewObjectType(JSON_ARRAY)", a call that produces the same
result with a lot less overhead.

3. For similar reasons I replaced several occurrences of
"jsonParseString("{}")" with "jsonNewObjectType(JSON_HASH)".

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1271 9efc2488-bf62-4759-914b-345cdb29e865