Update README.md

build_system is not included with the repo so it needs to be created.
Merge pull request #695 from iandanforth/patch-3

Update README.md
Using new logo icon in README.

Also rearranged the title.
Merge pull request #696 from rhyolight/update-readme-logo

Using new logo icon in README.
Merge pull request #692 from scottpurdy/master

Spatial pooler pylint update
Remove trailing whitespace Pylint script since the functionality is built into Pylint 1.0+.