adds repair_geometries test
adds repair_geometries to stats rake task
adds geometry repairer to repair geometries before dissolving
changes buffering to 0.0
adds repair_query template to geometry_repairer
adds repair geometry befor intersecting marine areas
refactors repair geometries queries
Removes migration that has no parent

percentage_land column is never added
Refactors geometry populator

Moves country geometry responsibility into a class, so that objects that
needs it only require knowledge of what column they want repaired.
Cleans up documentation
Merge branch 'fix-geometries' into viz-stats-unbroken

* fix-geometries:
  Cleans up documentation
  Refactors geometry populator
  Removes migration that has no parent
  refactors repair geometries queries
  adds repair geometry befor intersecting marine areas
  adds repair_query template to geometry_repairer
  changes buffering to 0.0
  adds geometry repairer to repair geometries before dissolving
  adds repair_geometries to stats rake task
  adds repair_geometries test