docs: fixes broken links.

Small correction to add a link to the source in the documentation, previously
it was a placeholder.

`rustdoc` does not appear to package assets with the docs, therefore
relative links looking for static files do not work. The links are
consistent enough on github that the static files can be directly linked
to on the master branch.

src/lib.rs

@@ -29,7 +29,7 @@
 //!
 //! The following examples show a quick example of some of the very basic functionality of `clap`.
 //! For more advanced usage, such as requirements, conflicts, groups, multiple values and
-//! occurrences see the [documentation](https://docs.rs/clap/), [examples/](examples) directory of
+//! occurrences see the [documentation](https://docs.rs/clap/), [examples/](https://github.com/kbknapp/clap-rs/tree/master/examples) directory of
 //! this repository or the [video tutorials](https://www.youtube.com/playlist?list=PLza5oFLQGTl2Z5T8g1pRkIynR3E0_pc7U).
 //!
 //! **NOTE:** All of these examples are functionally the same, but show different styles in which to
@@ -366,13 +366,13 @@
 //!  * **Red** Color: **NOT** included by default (must use cargo `features` to enable)
 //!  * **Blue** Color: Dev dependency, only used while developing.
 //!
-//! ![clap dependencies](clap_dep_graph.png)
+//! ![clap dependencies](https://raw.githubusercontent.com/kbknapp/clap-rs/master/clap_dep_graph.png)
 //!
 //! ### More Information
 //!
 //! You can find complete documentation on the [docs.rs](https://docs.rs/clap/) for this project.
 //!
-//! You can also find usage examples in the [examples/](examples) directory of this repo.
+//! You can also find usage examples in the [examples/](https://github.com/kbknapp/clap-rs/tree/master/examples) directory of this repo.
 //!
 //! #### Video Tutorials
 //!
@@ -391,7 +391,7 @@
 //! `clap`. You can either add it to the [examples/](examples) directory, or file an issue and tell
 //! me. I'm all about giving credit where credit is due :)
 //!
-//! Please read [CONTRIBUTING.md](.github/CONTRIBUTING.md) before you start contributing.
+//! Please read [CONTRIBUTING.md](https://raw.githubusercontent.com/kbknapp/clap-rs/master/.github/CONTRIBUTING.md) before you start contributing.
 //!
 //!
 //! ### Testing Code