Add partial fraction expansion exercise
Change wording
Add partial fraction expansion exercise

Summary:
Added a partial fraction expansion exercise based on Sal's partial
fraction expansion 1 video.

Reviewers: eater, alpert

CC: stephanie

Differential Revision: http://phabricator.khanacademy.org/D1054
Fix spacing, expr, silly problems
Lint down to <80 character lines
Add some extra helpful variables
Write real hints
Add video hint exercise
Lint down to <80 character lines
Adding Exercise Converting Fahrenheit to Celsius
Added accepting in decimals and Celsius to Fahrenheit
Remove old matrix experiment files.

In the qhints experiments (defined_and_undefined_matrix_operations.html, matrix_dimensions.html), choose the qhints alternatives. They performed marginally better, but not by a statistically significant amount.

In the video hint vs. solution only vs. steps only vs. traditional hints, choose traditional hints, with the goal of eventually extracting out the text into subhints. The steps only alternative performed better than the other alternatives in the new proficiency experiment, and roughly tied for best performance in the first review experiment (not sure if statistically significant). However, I suspect that some users learn better from having explanations in text, so having the text available in subhints sounds like the right way to go.

Auditors: eater, alpert
dded the word"degrees" to the solution box. Properly indented code and
made sentences gramatically correct. Chenged file name to
converting_temperatures.html
Add exercise: Coin flip sequences

Summary:
Boil down coin-flip exercise some more, refactor.

Zapped one human-generated pattern and created two more.

Remove highcharts dependency; refactor

Test Plan: Local in Chrome, FF, and IE8

Reviewers: cbhl

Reviewed By: cbhl

CC: alpert

Differential Revision: http://phabricator.khanacademy.org/D2073
Fix polynomials derivative method

Auditors: eater, stephanie
Merge pull request #41319 from kushmaheshwari/master

Temperature Conversions(Fahrenheit vs Celsius)
nit from d029dd7a262bcf6ad3a444653a975f9df1c4e99d

Test Plan: Open addition 0.5 locally, Chrome/OS X

Auditors: eater, alpert
Merge branch 'master' of github.com:Khan/khan-exercises
Fix typo in compound_inequalities

Test plan: Local

Auditors: cbhl
Fix width bug in coin_flip_sequences

Auditors: cbhl

Test plan: Test in GAE dev server