adjusted wording in Models, Views, & Presenters section about Passive View that I thought was confusing
adjusted wording in Getters & Setters section about Model.get() that I thought was confusing
Added missing apostrophe to the contraction "it's"
Attempting to make the 'Events' section more clear.

Minor language tweaks and grammar corrections.
Some language tweaks to the Router and Sync sections.
Fixed indentation; added missing semi-colon
Fixed Mixin/Inheritance example indentation to be 2 spaces.
Fix typo in comment url.
Fix code block markup.
minor type in comment line 1616
Add missing 'of' word.
Placeholder image extension is .png (not .gif).
Minor cody tidy up (white space, added var, redeclaration of PanelAdvanced).
Fix typo in comment url.
extended/merged MVC theory part into the book
merge and restructuring of the intro section with simple js mvc implementation - partialy done
merge and restructuring of the intro section with simple js mvc implementation - partialy done
Restructuring and further refining of the MVC intro section and basic MVC implementation
add lumbar chapter
Remove merge conflict comment