Send request to the API to set a task's progress
Add progress infos to TaskInfo
Set progress fields as optional as they're not returned if not progress was set
Merge pull request #32 from phacops/get-progress-in-task-info

Add progress infos to TaskInfo
Merge pull request #31 from phacops/set-task-progress

Send request to the API to set a task's progress
extract local variable client to package level
add comment for HttpClient package variable
Merge pull request #33 from iron-io/extract-http-client

Extract local variable client to package level

closes #28