Use ES7 style class members for event handlers so that 'this' is
automatically bound and each definition site doesn't need to manually
invoke 'bind'.
This makes all existing ES2015 class usages in components use the
same mechanism for binding.
Where necessary, prefix the classes imported from react-component
with 'Rc' rather than prefixing the Ant classes with 'Ant'.
The prefixing of Ant classes wasn't consistent and isn't necessary
in many cases.
afc163
Bruce Mitchener
yiminghe
Benjy Cui