Fix FeatureGroup.removeLayer removing popups

[danzel]

When removing a marker from a FeatureGroup, only remove the popup if it was put there by the FeatureGroup.

Refs danzel/Leaflet.markercluster#24

[blowsie]

I found the pop ups unreliable on both spiderfied and unspidefied markers.

See this video I made regarding the reliability of spiderfied markers.
https://dl.dropbox.com/u/14037764/Development/stackoverflow/leaflet/spierfied/spiderfied-pop-ups-reliability.html

At the time of posting unspiderfied markers don't work at all for me.

[mourner]

Do you mean that it's unreliable even with this pull merged in?

[danzel]

I've reopened the bug so lets take the discussion back there.
Seems solved for me though.

[mourner]

Could you change the target of the pull to stable branch, so that I could release 0.4.2 stable that works with the clusterer?

[mourner]

Generally I think that it's better to do bugfixes in the stable branch, so that I could decide whether to merge them into stable or master (depending on how critical a bugfix is).

[danzel]

Shouldn't this go to master then be cherry picked to stable? Happy to change if that's the way you want to do it though

[mourner]

If I merge this pull into stable, it includes master commits, but I'm not very strong at git — what's an easy way to cherry-pick commits into stable from master after that? Or I'd have to just copy-paste?

[mourner]

OK, I read about git cherry-pick command :)

[mourner]

Released Leaflet 0.4.2 with two bugfixes included, you can now put "Requirements: Leaflet 0.4.2" into your readme :)