Update jedi version in requirements
remove the option: --use-mirrors for pip in Makefile, in case old pip install command dose not support this option
fix copy/paste documentation error

the overview documentation for keybindings clearly had a
copy/paste error between the C-. and C-c d keys. Fixing based on
the summary string provided in jedi:show-doc function.
Merge pull request #121 from sdague/master

fix copy/paste documentation error for jedi:show-doc
Merge pull request #98 from thomasf/master

Update jedi version in requirements
Merge pull request #109 from abyssly/remove-option-use-mirros-for-pip

remove the option: --use-mirrors for pip in Makefile, in case old pip in...