Fix migration error on database with zero IDs
Fix Mocha deprecation error
Change DEFAULT_SRID from -1 to 0

Fixes an annoying error message that gets spewed out during rspec runs:

NOTICE:  SRID value -1 converted to the officially unknown SRID value 0
Fix deprecation warnings in ObservationsController
We don't use stories.
Minor bugfix with recent taxon change validation.
Bugfix: observed_on_string parsing was broken for some formats.
Minor fixes.
Merge pull request #169 from md5/dev-fixes

Dev fixes
Numerous small fixes
* BUGFIX: photo selector on taxa/show wasn't allowing unlicensed
  photos
* GuidePhoto only auto-adds licensed photos
* Data Quality Assessment shown by default, visibility stored in
  session
* check list auto taxon adding moved out of slow queue
* wikipedia style fixes and removed video
* BUGFIX: uploading multiple photos after CSV obs upload was broken
Made it impossible to create check lists for large places.
This was causing problems. Will restore when I test a data migration.