Update Vuescan version number and checksums
Upgrade OBS to 0.6.2
Merge pull request #6953 from michaelfairley/update_obs_to_0.6.2

Upgrade OBS to 0.6.2
change quote type (to single) in obs.rb uninstall
Add Leksah v0.14.1.0-ghc-7.8.3

Closes #6955.
Merge pull request #6956 from vitorgalvao/fix-6955

Add Leksah v0.14.1.0-ghc-7.8.3
Merge pull request #6946 from gsong/george/vuescan

Update Vuescan version and checksums
moved sha256 above url in vuescan