Some cleanup of the "learning_gem5" directory (#16)
* Added Boost library as a dependency.
* Removed apt-get/apt inconsistency (just using apt now).
* "to" -> "two" (grammar error).
* Fixing typos and minor errors in cache_config.md.
* "two_level_opts.py" -> "two_level.py"
* Improved summary of contribution guidelines.
* Fixed some bad formatting of code segments. Also commented out some
broken links.
* Commenting out dead link.
* "replaying" -> "replacing"
* Added language identifiers to code-blocks in helloobject.md
4 files changed
