Merge branch 'release-1.2.4'
Merge branch 'release-1.2.4.1'
Update README

Updated installation option using the devtools package
Fixed mincTtest bug, bumped to version 1.2.4.2
Merge branch 'hotfix-1.2.4.2'
Merge branch 'master' of github.com:mcvaneede/RMINC
Merge branch 'master' into develop