Aspell mods and a few grammar fixes

Ran aspell on each *.md file.  I was attempting to be liberal about the changes and ignore Aspell wanting to change words like "metaprogramming" to "meta-progamming" and "refactoring" to "re-factoring" because whether Aspell is correct or not, it didn't seem like a big enough change.


Chicago manual of style says close compounds
http://www.chicagomanualofstyle.org/16/images/ch07_tab01.pdf, see "4. words formed with prefixes"