added more info about r->main->count to the debugging logs.
fixed test cases using the deprecated math.mod() method.
bugfix: the original Lua VM error messages might get lost in case of Lua code crashes when user coroutines were used. thanks Dirk Feytons for the report in github issue #208.
fixed a test case that may fail expectedly in slow testing mode.
added a (passing) test for github issue #208: coroutine as iterator doesn't work
fixed more test cases using systemtap that could fail expectedly in slow testing modes.
updated docs to reflect recent changes; also bumped version to 0.7.15.
minor optimizations in the script engine to save a little memory.
added (passing) tests for using $0 in the replacement template when no capturing parenthese are used in the regexes.
optimize: removed the unsed "size" field and related computatins from the script engine.
refactor: renamed ngx_http_lua_script_copy_capture_code_t to ngx_http_lua_script_capture_code_t.
fixed test cases in uthread-spawn.t for slow testing modes.