Sign PUT API requests
Edit Plot/Tree details

Edit tree/plot fields which the current user permission allow

Included:
* Text Edits
* Choice Edits
* Species change
* Dynamic DBH <--> Circumference
* Plot location

Not included:
* Change photo
Remove unused files
Whitespace
Merge pull request #28 from OpenTreeMap/topic/edit-tree

Edit Plot/Tree to work with OTM2 API