Housekeeping on social-likes - no version change

See https://github.com/cdnjs/cdnjs/issues/2578#issuecomment-33577958
for background.

Includes deletions. Removed .php files, demos, extraneous *.md files.
Un-min’d JS file left in 2.0.8/src directory as it doesn’t exist in
2.0.8/ and may be in use. Tidied up package.json.