pbc requests responses cleanup

PBC requests/responses cleanup.
Classes that are added, removed or changed:

In src/ggrc/assets/mustache/audits/tree.mustache on line 274:
class added: request-list
class changed: from rq-colors to colored-list

line 295:
class added: request-list
class changed: from rq-colors to colored-list

line 302:
class added: request-list
class changed: from rq-colors to colored-list

line 309:
class added: responses-list

In src/ggrc/assets/mustache/requests/tree.mustache on line 7:
class removed: request-list
class removed: request-redesign

line 168:
class add: responses-list
class removed: rq-colors-inner
class changed: from rq-colors to colored-list

In src/ggrc/assets/mustache/responses/tree.mustache on line 9:
class removed: responses-list
class removed: request-redesign