updated setup.py
updated doc
changed the order
rewording
added an example
made it support -kmeta format in doc
fixed the wrong usage when function hasn't keyword arg
fix typo
updated doc
added the slide
added slide to README.rst
Revert "added slide to README.rst"

This reverts commit 000edddb96708ba7e6ccb7a1fd8e6d3bf1c861d6.
added the explaination for the slide
rewording
added seealso
updated README.rst
removed an unplus char
fixed a typo
fixed another typo
fixed typo ...