build.sh respects CC/CXX envirnonment variables.
Linker flags for stuff in /usr/local.
LLVM version removed from flag. LLVM 3.3 is still the suggested version.
Added markdown compile docs. Added links to README.md.
Removed compile.txt in favour of compile.md.
Note for printable instructions.
Merge pull request #35 from m000/umaster

Compile documentation in markdown.