Differential Calculus and Sage

An update to David Joyner's edits of William Granville's calculus textbook.

This project has the following goals for updating the free Differential Calculus and Sage textbook TeX source:

1. Correct errors in math equations.
2. Correct typos.
3. Synchronize output builds (PDF, HTML).

Additional possible goals (depending on my future education as to whether these are possible or desirable):

1. Automate figure generation from Sage source code.
2. Include complete exercise answers.