Added S3 support for pelican quickstart.
fix for #783 - AttributeError: 'NoneType' object has no attribute 'find' when using summary plugin with static files
Install webassets & cssmin only for Python 2.

webassets is not py3 compatible yet. This will avoid a failed install of
webassets for each py3 Travis build.
Merge pull request #799 from saimn/webassets_py3k

Install webassets & cssmin only for Python 2.
Merge pull request #784 from idyedov/master

fix for #783
Merge pull request #775 from lexual/s3_support_for_quickstart

Added S3 support for pelican quickstart.
make pelican-quickstart and the Makefile it generates support py3k.
Prevent people from setting STATIC_PATHS to a str

Previously you could accidentally set for example site/css and pelican would iterate through the string and attempt to copy '/' into your output.
Check all lists are not strings.
Fixes #630
Remove multi_part plugin

As part of our continuing effort to move plugins their own repository,
this plugin was moved to the pelican-plugins repository.