Merge pull request #17648 from Archaeopteryx/settings-bug988296-imsSettingsHeader

Bug 988296 - imsSettings-header points to messageSettings, should be imsSettings ('Message settings' vs. 'IMS settings'). r=arthurcc
Merge pull request #17624 from hfiguiere/bug988114

Bug 988114 - Hardcode the sha1 we want for the gaia-node-modules. r=yuren,kgrandon