Merge pull request #6892 from terminalmage/docs

Audit module documentation (Q to R)
Remove trailing white-space.
module.pip: added doc for new option "use_wheel"

pip state and module got new option for pip>=1.4 called "use_wheel". State got properly updated doc for this change, but module not. This commit adds two lines of doc for pip module too.
Merge pull request #6898 from vlcinsky/develop

module.pip: added doc for new option "use_wheel"
Remove more trailing white-space.
Adapted `unit.modules.virtualenv` to use `salttesting.mock`
Adapted `unit.modules.alternatives_test` to use `salttesting.mock`
Adapted `unit.modules.win_status_test` to use `salttesting.mock`
Adapted `unit.modules.archive_test` to use `salttesting.mock`
Adapted `unit.modules.gem_test` to use `salttesting.mock`
Adapted `unit.modules.pip_test` to use `salttesting.mock`
Adapted `unit.modules.poptgres_test` to use `salttesting.mock`
Adapted `unit.modules.rvm_test` to use `salttesting.mock`
Adapted `unit.payload_test` to use `salttesting.mock`
Adapted `unit.pillar_test` to use `salttesting.mock`
Adapted `unit.utils.warnings_test` to use `salttesting.mock`
Adapted `unit.states.file_test` to use `salttesting.mock`
Adapted `unit.states.gem_test` to use `salttesting.mock`
Adapted `unit.states.pip_test` to use `salttesting.mock`
Adapted `unit.states.rvm_test` to use `salttesting.mock`