backwards compatibility w/ ruby 1.8.
add travis config.
add YARD dependency.
add travis badge to README.
update travis.yml w/ correct script information.
add `test` as default rake task.
bump version number.
generalize user and folder code.

remove references to `canvas_user` and replace w/
`app_user`.
remove unused AdobeConnect::Session class.
remove references to removed AdobeConnect::Session.
hide travis.yml (duh).
...
fix session regex for 1.8 support.

was previously using a lookbehind that 1.8 blew up on.
fix 1.9 hash previously missed.
ignore .ruby-version file.
sort params alphabetically to ensure order in < 1.9.
reduce version number on rake dependency.
bump version number.
actually return adobeconnect::response.
version bump.