Remove unneeded exports from mod_lua.

Removed non-existent funcions from header.

Use proper type to kill compiler warning.

Add new directives, LuaInputFilter/LuaOutputFilter for creating content filters using Lua.

fix "lua_vmprep.c:29:6: warning: no previous prototype for ‘ap_lua_init_mutex’ [-Wmissing-prototypes]"

Add a server scope for Lua states (in LuaScope), which creates a pool of states with manageable minimum and maximum size.

mod_lua: Pass on the request_rec to ap_lua_get_lua_state, so we can use it for allocating memory for the cache info lookup.

mod_lua: Fix up LuaCodeCache: - Check both mtime and size of a file when comparing with cache, in case the file is being written to while read - If LuaCodeCache is 'never', only reload it if it has been run once or more. - Never use cache if LuaScope is 'once'.

Add LuaCodeCache directive for controlling in-memory caching. This might need some tweaking on the hash key generation for the mtime lookups, ideas are welcome.

change various strings from char * to const char *

add per-dir config merging to mod_lua so LuaHook* in multiple per-dir sections behaves as expected instead of discarding previous sections.

remove lingering reslist references before killing server scope

remove ability to set min and max pool sizes for server scope in prep for removing server scope

remove some debug logging which snuck in

More cleanup: Expand tabs and some more indentation fixes No functional change

Cleanup effort in prep for GA push: Trim trailing whitespace... no func change

apply patch from zhiguo zhao <zhaozg@gmail.com> to significantly improve server scope handling

fix symbol space and exports

Change apl_get_lua_state to take a apl_vm_spec instead of a filename, and to load the bytecode if it is present, rather than the file, as this gets the inline config file blocks hooks working again.

Reformat mod_lua according to the HTTP Server Project C Style Guide: <http://httpd.apache.org/dev/styleguide.html> No functional changes.

Rename all files in mod_lua to have a lua_ prefix, as things like 'config.h' are way to generic and will often conflict with other include files.