Merge branch 'release/1.1.0'

* release/1.1.0: (99 commits)
  Adding better illustrative examples.
  Fixing typo.
  Updating changelog.
  Adding better examples to the has_accounts and has_groups helpers.
  Updating _resolve_group and _resolve_account docs.
  Fixing implementation bugs.
  Adding tests for Group.has_account() and Group.has_accounts().
  Implementing Group.has_account().
  Implementing Group.has_accounts().
  Adding docstring for Group.has_account().
  Adding two skeleton methods.
  Renaming utility methods:
  Updating ValueError wording.
  Resolving unmatched name params for Group helper methods.
  Adding proper test URLs.
  Using client.BASE_URL.
  Using client.BASE_URL.
  Removing Group.unique_attrs.
  Refactoring the Account._resolve_group() and Group._resolve_account() helpers.
  Adding necessary import.
  ...
Merge pull request #41 from stormpath/development

Release 1.1.0
Merge remote-tracking branch 'upstream/master'

* upstream/master:
Adding release date.
Merge pull request #42 from rdegges/master

Adding release date.