minor edits
adds what is a visualization
minor edits
adds what is a basemap
adds projections
edits sidebar
edits custom SQL
adds wizard descriptions
resolving conflict

Conflicts:
	cartodb_ui.md
adds visualizations
small edits
no edits
no edits

(things got weird since I'm using the github GUI, this and other "no
edits" commit are only happening because it's forcing me to)