Merge pull request #29 from paulo-casanova/master

Added some improvents to jira-client.
Fixed passing parameters in url. One case with "user" API.
Proper serialization of custom fields values. Before ValueTuple was serialized to toString();
Merge pull request #30 from witekw/master

Fixed passing parameters in url to the "user" API.
Merge remote-tracking branch 'origin/pr/31'
moved deleteComponent to Component class for consistency, replaced getComponent with a passthrough to Component.get, and cleaned up URIs
Merge pull request #1 from rcarz/master

Merging rcarz/jira-client changes to my branch.