Ensures aura and ui styles are always before app css by given them higher initial frequencies

@bug W-1967243@
@rev goliver@
Merging origin/bob/master-pending/ui-style-frequency into master
[maven-release-plugin] prepare release aura-framework-0.519
[maven-release-plugin] prepare for next development iteration
ui:outputRichText - add b and i tag to the white list.
@W-1967320@
Merging origin/ssun/master-pending-addMoreTagsToOutputRichText into master