Correct typo in geometry type (thanks @jystic)

Previously read 'multilinstring' instead of 'multilinestring'.  Letting the compiler check for typos instead now.
Stop other interactions when dragging
Merge pull request #802 from tschaub/802-multilinstring-typo

Multiline strings are not rendered correctly due to typo in VectorLayer
Merge pull request #819 from twpayne/fix-819

Drag rotate and zoom example is broken
Merge branch 'official-master' into overviewmap