Update README.md
Merge pull request #27 from nferraz/master

Make global variables local
change usage doc, --period can take negative values too
Support unicode when running under emacs
Merge pull request #28 from offbyone/unicode-support-in-emacs

Support unicode when running under emacs
Add ansi, unicode options too
choose the default based on ENV
unicode under EMACS, ascii under dumb terminal
this can be overridden with --ascii,--ansi,--unicode options
Update README.md
Merge https://github.com/k4rthik/git-cal
Removed global variables
Removed more global variables

Created sub calendar, which deals with dates