client & check names cannot contain spaces or special characters
       support: a-z A-Z 0-9 _ . -
Merge pull request #557 from portertech/definition-names

client & check names cannot contain spaces or special characters
[docs] added sensu docs to readme
[docs] updated the changelog, 0.10.0 TBD
Merge pull request #558 from portertech/docs

updated readme (docs link) & changelog (0.10.0 TBD)