Remove Instructions link in nav. Improve tab help.
Revise help text for the Trees tab.
Add help text for the Files tab.
Add help text for Tools tab and example tool links.
Cleanup OTU Mapping help and add project links.
Add help text for the Annotations tab.
Standardize menu text
Enable UI for import-study-from-TreeBASE

NOTE that we're not yet ready for this on the API side. Just getting
ready...
Enable TreeBASE creation, add options for NeXML
Finish and enable import-from-pasted-NeXML
Merge pull request #237 from OpenTreeOfLife/curation-help-text

Curation help text
Merge pull request #241 from OpenTreeOfLife/add-new-study

UI for importing from TreeBASE and NeXML files
Merge branch 'master' into new-annotation-storage