Fix OpenStreetMap attribution

- OSM is no longer CC BY-SA
- You're not using CloudMade imagery, but OpenStreetMap's own
Merge pull request #69 from derickr/openstreetmap-attribution

Fix OpenStreetMap attribution
Adds data from phpmentoring to the map
Fixes issue with double clicks onto markers
Adds more colored markers
color-corection
Merge pull request #71 from heiglandreas/feature/addMentoring

Feature/add mentoring
Adds controller
Merge pull request #72 from heiglandreas/feature/addMentoring

Adds controller
Fixes issue with spiderfy and usergroups

This commit fixes issue #68
Adds different color for apprentices

Adresses #71
Merge pull request #73 from heiglandreas/hotfix/popup

Fixes issue with spiderfy and usergroups
Merge pull request #74 from heiglandreas/hotfix/colors

Adds different color for apprentices
Fixes issue with icon

This fixes #75
Merge pull request #76 from heiglandreas/hotfix/#75

Fixes issue with icon
Fixes #77
Merge pull request #78 from heiglandreas/hotfix/#77

Fixes #77
Changed PHP mentoring url

Changed the url to .org instead of .com

Closes #81
Merge pull request #82 from rdohms/patch-1

Changed PHP mentoring url
Adds filter for webcal and chages a label

This commit addresses issue #42 by changing the location label to
"Location (Lat/Lon)" and adding a filter that will change any webcal-url
to a http-one