Fixed the memory functions required for LLVM to properly work.

This required the fixing of the features section to properly handle
passing on the use_std feature. It also required that the memory functions
were moved to the main library module instead of within the rust module
as was previously desired. The C module then correctly skips defining the
external C library functions.

Basic time functionality was also added.

src/c/mod.rs

@@ -0,0 +1,12 @@
+//! Handle defining the external functions from what ever C library is
+//! being linked against. These will use the C99 definitions so that
+//! this library is as up-to-date as it can be.
+
+
+mod string;
+mod time;
+
+
+
+pub use self::string::*;
+pub use self::time::*;