Fixed index_name_exists?
Fixed duplicatiion of tables with schemas
Return only public schema tables for non-postgres users
Update RSpec; address deprecation warnings

Task 1007
implement create_schema_if_not_exists

Task 1007
Remove note in Gemfile

Task 1007
Merge IntegraCredit/HornsAndHooves-pg_power#1 v2.0.4 'greyblake/1007_creates_schema_if_not_exists'

Task 1007
Task 1081

mod: lower SimpleCov threshold temporarily
mod: use byebug instead of the obsolete debugger

* greyblake/1007_creates_schema_if_not_exists:
  Remove note in Gemfile
  implement create_schema_if_not_exists
  Update RSpec; address deprecation warnings
  Return only public schema tables for non-postgres users
  Fixed duplicatiion of tables with schemas
  Fixed index_name_exists?