Static read and write functions on WKT parser

Use a singleton to implement static read and write methods on ol.parser.WKT.
Allow user to stop map at the end of a drag

If the time between the last move and now is longer than the configured delay, this means that the user stopped panning before releasing the map.
Style for attribution control
Merge pull request #729 from bartvde/wktsingleton

static read and write methods on ol.parser.WKT (r=@ahocevar)
Merge pull request #738 from tschaub/allow-stop

Allow user to stop map at the end of a drag
Simplify style
Merge pull request #739 from tschaub/attribution-style

Style for attribution control
Rename ol.projection to ol.proj
Change ol.Object event name syntax

'changed' to 'change' and '<attribute>_changed' to 'change:<attribute>'.
Merge pull request #694 from fredj/backbone-model

Change ol.Object event name syntax
Merge pull request #748 from twpayne/rename-projection-to-proj

Rename ol.projection to ol.proj
Display brightness/contrast value in button text
Display hue/saturation value in button text
Redefine ol.Pixel to be Array.<number>
Merge pull request #752 from elemoine/color-examples

Add color filter values to buttons
Merge pull request #478 from fredj/pixel-as-array

Redefine ol.Pixel to be Array.<number>
Exposing ol.geom.GeometryType

This is necessary for using ol.filter.Geometry.
Merge pull request #754 from ahocevar/geom-doc

Exposing ol.geom.GeometryType
Fixing linter error
Merge pull request #755 from ahocevar/newline

Fixing linter error