consolidate the README
add the macro for platform detection.
rename the macro to JSC_TAINTED_32 to JSC_TAINTED_EXTENDED,
JSC_TAINTED_64 to JSC_TAINTED_HASHMAP.
refactor the code, moving the TaintedXXX class to runtime folder.
Merge pull request #22 from neraliu/devel

merge the devel branch to master