remove import for missing shapefile
Merge pull request #60 from mapzen/remove-import-missing-shapefile

remove import for missing shapefile
Remove obsolete skeletron queries.

queries/skeletron-z(15, 16).pgsql
	-Remove the two skeletron queries because we don't use them any
	longer.
query optimizations

* create indexes for columns used in queries
* always use pre-computed way_area
  - add way_area column to tables lacking it
* create additional columns to store pre-computed values
* remove redundant vtm queries
* add columns to store simplified geometries
suppress_simplification config where appropriate
support applying db changes in single pass

A single pass through the tables makes the operation faster because
records only need to be written once.
remove no longer used post-import.sql
Remove skeletron references from tilestache.cfg.

tilestache.cfg
	-Remove the now superfluous top level keys `"skeletron"` and
	`"skeletron-2x"` and their corresponding values, as the
	skeletron queries were removed in 55e8747.
Merge pull request #61 from sevko/master

Remove obsolete skeletron queries.
COMMITTED VIA CIRCLECI: tilestache config update
parallelize single pass update across tables
use partial indexes for new columns
no need to create trigger for water_polygons
simplify poi level calculation
places can be either points or polygons
add comments describing tolerance calculation
Merge pull request #63 from mapzen/query-optimizations-single-pass-update

Query optimizations
COMMITTED VIA CIRCLECI: tilestache config update
take pgopts directly from cmd line

Taking the postgresql options directly from the command line is more
consistent with how the other sql scripts are used.
Merge pull request #64 from mapzen/sql-consistent-pgopts

take pgopts directly from cmd line