Merge pull request #128 from jonathanchrisp/staging

NoTask - merging latest features from staging branch
Merge pull request #134 from jonathanchrisp/staging

NoTask - Signals group endpoints
#133 - updated method comments to remove reference to Hashie::Mash
#129 - updated README.md
Merge pull request #135 from jonathanchrisp/update-comments

#129/#133 - updated method comments and README.md
NoTask - updated date in gemspec
NoTask - updated CHANGELOG.md
Merge pull request #136 from jonathanchrisp/staging

Updated Version 9.0.0
NoTask - fixed response error message parsing
Merge pull request #137 from jonathanchrisp/staging

NoTask - fixed response error message parsing
NoTask - updated gems to latest versions and date
NoTask - removed ruby-head from allowed failures
Merge pull request #138 from jonathanchrisp/staging

NoTask - updated gems to latest versions and date
NoTask - fixed conflict with bw_status_board_api gem, updated date in gemspec and version to 9.0.1
Merge pull request #139 from jonathanchrisp/staging

NoTask - fixed bw_status_board_api middleware conflict
NoTask - updated CHANGELOG.md
Update README.md
Added parent client endpoints
Updated comments following PR comments
Updated comment following PR comments