trying with faster array reset code (see http://stackoverflow.com/q/1232040)
fix failing test cases
use slice instead of _.clone per @caseywebdev
add collection models init to constructor
remove dead link
Merge pull request #2114 from hswolff/stray-link

Removes dead link from docs
Merge pull request #2106 from akre54/array-reset-speed-testing

Faster Collection _reset
Use === instead of == in Model#save

Its just a nit pick. I stumbled upon it today.
Merge pull request #2121 from gsamokovarov/patch-6

Use === instead of == in Model#save