refactor ClientCredentials
refactor session classes towards TokenRequestFactory with BasicSession
add docblocks
clean up superfluous syntax
add missing param to HttpBasic
use `self` with class constant references
refine naming
move phpci into bin/
extend support to PHP 5.4
refactor docs

refactor docs

refactor docs
disallow setting token store when requests have already been made
more docs cleanup
forbid multiple bearer auths
ensure references to OAuth are OAuth2, in docs
clarify provenance of the redirect URL in docs
Merge pull request #7 from easybiblabs/topics/client-credentials-http-basic

HTTP Basic Client Credentials with big ol' refactor