LuaRuntime.table_from method. See GH-31.
delete unused cimport
drop Python 2.5 and Python 3.1 support

Python 2.5 doesn't have abc module, and both Python 2.5 and Python 3.1 don't work with recent Cython.
drop **kwargs support for .table_from()
use abc in table_from
TST test for non-string keys
.from_table: special-case dict
TST commented out test for .table_from(wrapped_lua_table); explicit test for 'foo' in table
support _LuaTable in LuaRuntime.from_table(obj)
Merge pull request #34 from kmike/table_from

LuaRuntime.table_from method