v1.5.1

Public release of the LuNari 1.5.1:

* FIXED: Fixed nuget Conari version: "(1.3.0,)" > "1.3.0"
* CHANGED: Allowed extending LuaH.
* CHANGED: Updated XML doc for LuaH constants.
* CHANGED: Added forgotten declaration for 5.2 & 5.3: +`int lua_pushthread (lua_State *L);`
* NEW: API. added:

    +`void lua_pushcfunction (lua_State *L, lua_CFunction f);` /Lua 5.1; 5.2; 5.3
    +`void lua_arith (lua_State *L, int op);` /Lua 5.2; 5.3
    +`const char *lua_tostring (lua_State *L, int index);` /5.1, 5.2, 5.3
    +`void lua_insert (lua_State *L, int index);` /Lua 5.1; 5.2; 5.3
    +`void lua_remove (lua_State *L, int index);` /Lua 5.1; 5.2; 5.3
    +`void lua_replace (lua_State *L, int index);` / Lua 5.1; 5.2; 5.3
    +`void lua_register (lua_State *L, const char *name, lua_CFunction f);` /Lua 5.1; 5.2; 5.3
    +`size_t lua_rawlen (lua_State *L, int index);` /Lua 5.2; 5.3
    +`size_t lua_objlen (lua_State *L, int index);` /Lua 5.1