Merge pull request #238 from korczis/rest-merge

Properly get client
Merge pull request #239 from korczis/rest-merge

List users again
Merge pull request #240 from korczis/rest-merge

Fix tests
Adde more helpers
Added more helpers to project. Added pmapcat.
Changed simgulars to plurals in project helpers. Added stuff to todo
Rip of typhoeus
Merge branch 'rest-factory' of https://github.com/gooddata/gooddata-ruby into rest-merge