Update ch1.md

Fixed typo. anyhwere => anywhere
Fixed typo

indistiguishable should be indistinguishable
Fix typo: vairable => variable
Fix typo in Scope&Closure Ch3
rewrites and clarifications to ch4 (this + object prototypes). added legitimate tldr summary
more corrections to chapters 4 and 5 (this + object prototypes)
Merge pull request #64 from DickvdBrink/patch-1

Fixed typo
Merge pull request #61 from martinthogersen/master

Update ch1.md
Merge pull request #72 from ezhilvendhan/master

Fix typo in Scope&Closure - Chapter 3: Function vs. Block Scope
Merge pull request #68 from sunsations/typo

Fix typo: vairable => variable
starting to sync in edits from oreilly production
more QC1 edits from O'Reilly for 'scope + closures' title
fixing typo in ch1 of 'scope + closures'
Fixes some typos
fixes a misunderstood of typo. Now emphasized.
scope+closures: QC2 edits, hopefully pretty final
scope+closures: updating artwork from final book editing
scope+closures: correcting art scaling in markdown
scope+closures: updating with cover-art
Typo in Chapter 3