CDB-1767 Fix error on non-batch geocoder
CDB-1767 Several geocoder improvements

* Geocoder cache will run in configurable batches and using the
  same limits of the geocoder
* Increase geocoder cache batch size to 5k rows
* Fixes on geocoder row counts
CDB-1758 Add basic image metadata extractor

image = CartoDB::ImageMetadata.new(file_path)
image.width
image.height
CDB-1758 Test svg output on CartoDB::ImageMetadata WITH LOTS OF LOVE
Add .ruby-gemset to gitignore
Update debugger gem
CDB-1758 Add file dimensions validation on Asset model
CDB-1758 Fix assets api spec, fix error removing assets from s3
upload assets working in development environment
resolution error added to asset manager
CDB-1758 Fix asset spec
CDB-1758 Fix assets api specs
Merge remote-tracking branch 'origin/CDB-1767' into release/2.10.1

Conflicts:
	Makefile
Merge remote-tracking branch 'origin/CDB-1758' into release/2.10.1

Conflicts:
	Makefile