Add Triple table & fix diagrams to show it

Added Triple table to Core, and fixed All diagrams to show it.  * See
http://uchic.github.io/ODM2/schemas/ODM2_Feb26_MeetingBranch/diagrams/in
dex.html
* SamplingFeatureID not nullable in the Triple table - every use of the
Triple table requires that an Action is performed on a SamplingFeature
* Deleted SamplingFeatureID from Actions
Added ActionFileLink field to Actions table

* The addition of this optional field to actions eliminates the need
for many additional subclass tables for various ActionType (mostly in
other schemas).
* Modified diagrams slightly to accommodate the longer Action table.
* Also modified the comment for a few “Description” fields, to  remove
the word “Note”.
Additional mods on "Triple" table, now FeatureActionResult

I did the following:
1.  Renamed the Triple entity to FeatureActionResult
2.  I removed ActionID from the Results entity
3.  I made the relationship between Results and FeatureActionResult
1:1.
Merge pull request #22 from UCHIC/Triple_CoreUpdate

Triple core update