tab-separated output for "agenda"

Issue: empty lines in the output. ???
Merge branch 'tab-separated-value'
typo...
Allow shell commands in config file
Only and always use https
copy&paste errors fixed

Thanks to grahamking for pointing me to them
added help for --tsv option
fixed howto for tmux
tab-separated output for "agenda"
Merge remote-tracking branch 'shell/features/shell-cmd'
added documentation about shell commands in the config file
Merge remote-tracking branch 'https/features/ssl-only'
minor cleanup
changed shebang to "#!/usr/bin/env python"
changed terminal color code to use colorama for easy cross platform support
sys.stdout.write instead of print
merged upstream/master
fixed image links
Merge branch 'master' of https://github.com/insanum/gcalcli
added missing \n

_tsv put all the data in ONE line, instead of generating
one line per event.