Rock won't install on Lua 5.2 upwards because of lua-cjson

[DarkWiiPlayer]

As of b0fd53f lua-cjson is listed as a dependency in the rockspec. The current version of lua-cjson on Luarocks is not compatible with Lua 5.2 and upwards and fails to compile.

A fix for this has already been merged into the lua-cjson repository a while ago, but until a new release of this rock the best workaround is to:

• Download the lua-cjson rockspec
• Change the version to scm-1 (both in the file name and in the rockspec)
• Remove the tag attribute from the source section
• install this version of the rock for all affected Lua versions