lecture 06: fix typos
Merge pull request #20 from tochev/lecture_06_fixes

lecture 06: fix typos
lecture 07: numbers & transients
Add an example clarifying if-let

The slide did not point out what the if-let semantics are.
Fix typo
Fix several typos and improve formatting
Add more advanced destructuring slides

Rounded out the destructuring slides with:
* :strs and :syms
* destructuring rest sequences as map key/value pairs
* keyword arguments
lecture 04: cleanup and improvements
lecture 08: platforms
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