Update README.md
Merge remote-tracking branch 'ehsteve/draft2' into draft2
clarify that SQLite is not the default dialect (there is no default at all)
typos
Merge branch 'draft2' of github.com:ehsteve/sunpy-0.4-paper into draft2

Conflicts:
	3-5-Database.tex
Merge pull request #1 from derdon/draft2

Draft2