Spelling/Grammar Corrections to TXT Files

General cleanup of txt files.
More Refinements to history_and_related_works.txt

Cleaned up grammar, formatting, removed dead links, etc.
Clean up of README.TXT

Mainly just reformatting, spelling and grammar corrections. Also the
link to the wiki article on editing EDL's was broken, fixed.
Merge pull request #21 from davidshq/master

Spelling/Grammar Corrections to TXT Files