Allow to execute pcall(error(T)) when T is a table
Add error wrapper for values from error()
Call error object metamethod, if object has one

Lua 5.2 docs
"if the error object has a metamethod __tostring, the interpreter calls this metamethod to produce the final message"
Merge pull request #36 from loucash/develop

Allow to execute pcall(error(T)) when T is a table
Add standard lua library (bit32) for bitwise operations
Improve bit32.band, .bor, .btest and .bxor to handle arbitrary number of arguments
Add default values for bit32.band, bit32.bor and bit32.bxor
Limit values to 32 bits
Merge pull request #37 from loucash/develop

Add standard lua library (bit32) for bitwise operations