Merge pull request #27 from Erotemic/dev/2.4.1

Dev/2.4.1

Merge pull request #26 from Erotemic/dev/2.4.0

Dev/2.4.0

Merge pull request #24 from Erotemic/dev/2.3.0

Workon 311 suppot

tarball tag 2.2.0

tarball tag 2.0.0

Version bump

Merge pull request #294 from mcleary/fix-vs-version

Allow flann to build with VS2015

Document the change of the on-disk format in 1.8.0

Changed version to 1.8.1

Misc changes