Add lecture 09: namespaces, vars and metadata
Remove not existing form, add get to vectors
lecture 01: improve special forms slide
lecture 02: add `cond->` and `cond->>` slides
lecture 07: fix typos
lecture 08: fix typos
lecture 09: fix typos
fix bars
Merge pull request #26 from tochev/misc_fixes

Misc fixes
Merge pull request #25 from gshopov/02-add-threading-macro-slides

lecture 02: add `cond->` and `cond->>` slides
lecture 10: reducers and lighttable
treejs -> threejs