Add support for piecewise chebfuns. Closes #1037.
Implement Regula Falsi. TODO: Illionois.
Implement Illinois algorithm.
Adding Brent's method.
Edit DOCs.
Fix Brents method.
Make bisection algorithm in chebfun.inv() work for decreasing functions.

This closes #1098.
minor: whitespace fixes
minor: typo fix, use newline instead of line with one character
minor whitespace
Documentation and style fixes for @chebfun/inv.m.
Adjust tolerance in test_diffmat (for pass(43)).
Merge pull request #1118 from chebfun/fix-testDiffmat

Adjust tolerance in test_diffmat (for pass(43)).
Merge branch 'development' of github.com:chebfun/chebfun into fix-chebfun-inv
Merge branch 'fix-chebfun-inv' of github.com:chebfun/chebfun into fix-chebfun-inv
Response to review by AA.
Use relative tolerance in convergence test.
Fix a bunch of minor spelling mistakes.
Merge branch 'fix_typos_whitespace' into development
Merge remote-tracking branch 'origin/development' into fix-chebcoeffs