Revert "protect for in loops with hasOwnProperty"

This reverts commit e3cc96dbfb58ee873db457e74de7c7774a25bf45.
Merge pull request #270 from probins/argparsercenter

Make options.center compatible with permalink.
Making it safe to destroy a permalink.

Previously, a map could not be destroyed if it included a permalink control without an "element".  In addition, a permalink control could not be destroyed if it didn't have a reference to a map.
Merge pull request #273 from tschaub/permalink

Make permalink destruction safe (r: @ahocevar).
add @tschaub's test_extend_event back
Merge pull request #272 from elemoine/revert-hasownproperty

do not generalize use of hasOwnProperty
add missing statement-ending semi-colon, refs #272
Separating UTFGrid example markup and js source.
Single argument constructor for UTFGrid layer.
Doc cleanup for UTFGrid layer.
Tests for UTFGrid layer and control.
Merge pull request #56 from jorix/3576-MeasureImm

#3576 Incorrect geometry passed to measurePartial
Provide map and pixel location to callback.
UTFGrid geography class example.
Merge branch 'master' of github.com:openlayers/openlayers
Fixing Tween tests.

Thanks @tschaub for the requestAnimationFrame hint. See #249
Example for cross-origin xml
fix deprecated/WMS and deprecated/MapServer tests
"snappingOptions" option is not used neither in lib examples and evidence.
Removing duplicate setCanvasStyle method.

Thanks @jorix for catching this (see #238).