Add a new function to specify multiple key specification
Fix problem that can't specify C-j
Fix problem that can't specify C-j
Assign command name (workaround).

Some elisp programs, such as Mew, check command name by `symbol-name'.
So lambdas cause error.
mykie:define-key: Assign unique command name
Merge pull request #5 from rubikitch/feature

Assign unique command name in mykie:define-key. Lambdas cause error in Mew. It is workaround.