fix truncation for long wkb data

v0.1.3

encoding/wkb: only limit multi allocations not read length

better handling of nil values in encoding/wkb Scanner and Value

See #21 and #22

Fix planar.Area for polygons with holes

v0.1.1

add some more planar area tests and comments

retag of v0.1

v0.1.0

fix travis, 1.10 yaml....

Initial Release

v0.1

fix travis, 1.10 yaml....