Fixed the roots function to properly parse the case when 'complex' and 'all' roots are requested.
Added some tests at the chebfun level to test the chebfun roots function with the periodic flag.
Merge remote-tracking branch 'origin' into fix-fourtech-roots
Coding style conventions.
Merge branch 'fix-fourtech-roots' into development
Merge branch 'development' of github.com:chebfun/chebfun into development