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.

README.md

@@ -1,3 +1,58 @@
-# C #
-This library will provided binding for the standard C functions. Later, as a
-stretch goal, this library will attempt to implement those functions in Rust.
+# Pact #
+This library will provided the binding for the standard 'C' functions.
+Later, as a stretch goal, this library will attempt to implement those
+functions in Rust.
+
+## Features ##
+This library handles several different ways of providing what is needed
+at the 'C' binding level.
+
+### Standard C Library ###
+
+This is the default feature set. Or you can add:
+
+```
+   default-features = false
+   features = ["c_lib"]
+```
+
+It will provide a link to the 'C' standard library. This will make it so
+that your code is executable and can call functions and use structures from
+the standard 'C' library.
+
+### Rust C Library ###
+
+```
+   default-features = false
+   features = ["rust_lib"]
+```
+
+Currently, this does not work. Later, this will provide a Rust version of
+all the 'C' standard library functions. This is a **huge** stretch goal.
+It may not happen, or it may take a really long time to get this done.
+This will require alot of platform specific work.
+
+### No Memory Manipulation ###
+
+```
+   default-features = false
+   features = ["no_mem_manip"]
+```
+
+This feature tells the library to not define the memory manipulation
+functions that Rust requires for LLVM. These are:
+
+   * memcpy
+   * memmove
+   * memset
+   * memcmp
+
+### Weak ###
+
+```
+   default-features = false
+   features = ["no_mem_manip", "weak"]
+```
+
+Activates weak linkage on ELF objects. This is only useful when combined with
+the 'no_mem_manip' feature.