improve performance of obj file loading

Merge pull request #40 from JuliaIO/sd/error07

allow failure on master

fix obj loader

Merge pull request #38 from rdeits/fix-obj-face-normal

fix obj vertex//normal face format

fix obj containing uvs

v0.1.1

use correct length

Supporting 0.6

Merge pull request #32 from rdeits/require-release

require released version of Julia now that 0.6.0 is out