adding files for trigonometric interpolation.
renaming a file.
adding tests for trigBary and interp1.
Improving the output when exporting from the GUI to m files.

Following up on various suggestions made by @trefethen.
Merge branch 'development' of https://github.com/chebfun/chebfun into feature-trig-interp
adding references for trig interpolation.
adding a test and some comments for interp1.
fixing a small bug
Ensuring backwards compatability for first order integral equations.
Adding a test for the backwards compatability of int. eqn.
Adding Daubechies function to gallery.

Code for computing the function comes from @trefethen.
Coding style changes.
Merge branch 'feature-gallery-daubechies' into development
Fixing whitespace in Chebgui exports.
Making datestr in Chebgui exported files more appealing.
Further modifying datestr in exported Chebgui files.
Merge pull request #1287 from chebfun/fix-chebguiExporter-output

Improving the output when exporting from the GUI to m files.
Merge pull request #1295 from chebfun/fix-integral-IVPs

Ensuring backwards compatability for first order integral equations
Merge branch 'feature-trig-interp' into development
Remove some unnecessary whitespace/comments in trigBary.