Prepare for extracting auth-roles from main codebase

- Remove unused classes
- Move BaseHtmlProvider and StreamingBaseHtmlProvider to fcrepo-http-api
** These classes implicitly depend on velocity.properties that is in fcrepo-http-api
- Eliminate dependency of fcrepo-auth-common on fcrepo-http-api
- Move BypassSecurityServletAuthenticationProvider to fcrepo-auth-common
Remove fcrepo-auth-roles-basic and -roles-common

Resolves: https://www.pivotaltracker.com/story/show/74266946