PR commit for adding support for degree 1 curves
removed knn query code for the single nearest neighbor case since it was incorrect and unused.
Merge pull request #589 from est77/master

Made math functions a bit faster by ignoring errno in linux and OSX.
Added SharedLibrary class and unix unit test.
Added first version of plugin tile callbacks.
fixed curve pr
small fixes to PR
Merge pull request #582 from sriravic/curve_pr

Adding support for degree-1 curves.
minor code tweaks.
changed the depth aov to use 4 channels since 1-channel aovs are not properly supported yet.
fixed compilation of makefluffy after recent introduction of degree-1 curves.
small code simplifications and cleanups.
More displays work
Merge branch 'master' into est_display_plugins
Prepare for PR
Added link to dl libraries.
Fixed review comments.
Merge pull request #590 from est77/est_display_plugins

Display plugins, first version.
small code tweaks.
small code tweaks.