Update README.md

Added full list of 32-bit Arch Linux dependencies and the two Fedora 20 dependencies mentioned by pbirnzain.
Update README.md

Oops.  Forgot one of the corrections made by pbirnzain - "gcc-c++gcc" corrected to "gcc-c++"
Merge pull request #8 from carbohydratesn/master

README update with required dependencies