Static release

Release 0.98.4

Checked the timings; Travis passes for Linux and MacOS

Updated release notes

README

Show warning on some unused matrices

Merge branch 'master' of github.com:genetics-statistics/GEMMA

gemma 0.96, first stable release.

gemma 0.95.2a, which fixes bug pointed out in Issue #36.

Creating release following request in Issue #33; more stable releases…

… forthcoming.