Doesn't accept accented characters in queries.

[jpilorget]

Hi, I've been having some trouble querying conditional on names with accented characters such as "Córdoba". Luckily I looked the code and was able to solve the problem by modifying the method that runs the soqlQuery in rforcecom.query() and setting the encoding to "UTF-8" in xmlParse inside xmlToList2(). I'll do a pull request with the modified code so you can use it if you want to.

Thanks for developing the package!