feat(frontents/lean/parser_cmds):
Print the type of variables introduced by definition, hypothesis (variable) or proof.
fix(kernel/level): bug reported by Floris

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
feat(frontends/lean/parser_cmds): add 'print definition' command

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
feat(emacs): add shortcut for executing Lean without loading the kernel

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
Merge remote-tracking branch 'blessed/master'
feat(kernel/kernel_exception.h): change application error messages

Error messages are now of the form:
Error: in application
    foo bar
Argument
    bar
has type
    baz
the expected type is
    baz'