CLC-882 - Implement Google task authoring
https://jira.media.berkeley.edu/jira/browse/CLC-882

This is the front-end piece and relies on CLC-887 see #424
CLC-887 - API endpoint to enable adding tasks.
https://jira.media.berkeley.edu/jira/browse/CLC-887
CLC-887 - Fix test breakage from change to method signature
Merge pull request #428 from raydavis/fixed-CLC-887

CLC-887 - API endpoint to enable adding tasks.
Merge pull request #425 from christianv/CLC-882

CLC-882 - Implement Google task authoring
CLC-887 Make Google Tasks emitter ID a named constant