Fixing feval for deltafuns

get() and feval() are consistent now and all tests
pass on my machine. This closes #663 and is a step
towards resolving #421.
Fix jumplines for color input.
Merge remote-tracking branch 'chebfun/fix-deltafun-feval' into fix-deltafun-feval
Merge remote-tracking branch 'chebfun/development' into fix-deltafun-feval
Merge remote-tracking branch 'upstream/development' into fix-chebfun-plot
Adding a CHEBMATRIX/CHEBPOLYPLOT() method.
adding varargin to feval of bnd and unbndfun
Merge branch 'development' into fix-deltafun-feval

Conflicts:
	@chebfun/dirac.m
Fixing feval for deltafuns

Chebfun diff was not updating point values
appropriately when a delta function was being
produced. The bug has been fixed. Also, a number
of test cases have been added in deltafun/test_feval.m
Removing removeDeltas() from chebfun/jump()

This resolves #421
Merge branch 'fix-deltafun-feval' of github.com:chebfun/chebfun into fix-deltafun-feval
Merge remote-tracking branch 'chebfun/development' into fix-deltafun-feval
Merge branch 'development' of https://github.com/chebfun/chebfun into fix-chebfun-plot
Cosmetic changes.
Making sure that delta fun plot doesn't break
checking empty style before setting it.
Merge branch 'development' of https://github.com/chebfun/chebfun into fix-chebfun-plot
Ensure vscale info is used in LINSOLVE().
Merge pull request #714 from chebfun/fix-chebfun-plot

Fix jumplines for color input.
Merge branch 'feature-chebgui-new' into development