Adding the language specification, CLtL2 and Successful Lisp.

Also, expanded PCL to its proper meaning.
ECL, not GCL for the C interop. Thanks, Ralph Moeritz.
Updating based on feedback from arvid

Added information on how to build from source, along with --fancy and the dynamic space size option.

fix #13
Update env:emacs.md

Showing a friend how to get things going and encountered BUGS.
Update content-footer.html

give more credit.
Merge pull request #15 from pnathan/master

Online merge testing GH merge.