Rename dividing decimals to dividing decimals 4
Retitle file
Dividing an integer by simple decimal
Include decimals representing mutliples of a quarter
Dividing decimals 3 exercise
Start dividing decimals 2
improve hints: fix #58118
Merge remote-tracking branch 'upstream/master' into div-dec
Dividing decimals 2 - some times the answer is a decimal
suggestion from spicyj

not sure if the numbers should be in code tags, but i think it looks better that way.
Add a new coefficient answer type

Test Plan: Ran tests.

Reviewers: emily

Reviewed By: emily

CC: eater

Differential Revision: http://phabricator.khanacademy.org/D3678
Tweak answer box sizing

Auditors: eater
Disallow leading `0,` on numbers

Summary: Fixes #62400.

Reviewers: eater

Reviewed By: eater

CC: emily

Differential Revision: http://phabricator.khanacademy.org/D3690
Make span selectors not as crazy

Auditors: alpert
Use complete sentences

Test plan: Load page in local mode

Auditors: alpert
Fix IE8 radio bugs

Auditors: alpert
Merge pull request #58392 from mauk81/patch-3

improve hints: fix #58118
Merge pull request #58397 from petercollingridge/div-dec

Dividing decimals
Fix denominator regex for add/sub rational expr 3

This is an ugly way to do it but it should hold for now.

Auditors: peter
Make volume_1 update the drawing in hints