Bug fix for concatenate()

New functions: pluralize() and concatenate() (extracted from existing…

… code)

Bug fix: Don't raise an error in format_path() if $HOME isn't set

Move "Spinner" class from pip-accel to humanfriendly

Timer class to easily keep track of long running operations

Bug fix for format_path()

Documentation now hosted on Read the Docs :-)

Rename package from `human-friendly' to `humanfriendly'

Add parse_date() function

Improve naming of arguments