Added RSS_TEASERS config variable

It may be useful if you want to export the whole page to RSS, but
keep your index page concise
Updated AUTHORS.txt and CHANGES.txt
Merge pull request #224 from imankulov/configurable_rss_teasers

Added RSS_TEASERS config variable
initial textile support, but real support is blocked on issue 225
Merge branch 'master' of github.com:ralsina/nikola
Textile support and Fix #225
add textile compiler to default config
unbreak two-file post creation
Creole Wiki markup support
update doit URL
bump doit required version (fix #211)
Merge pull request #227 from schettino72/doit-url

doit - update URL & required version
Tackling that import error under Py3k.
Wooooorking
Tests for working imports.
Script for manual testing of the workflow.
The .major attribute is not available everywhere.
Fixed "TypeError: unicode argument expected, got 'str'" raised by `install_theme` command.
Merge pull request #229 from mrabbitt/feature/install_theme_unicode_error

Fixed for install_theme error:  "TypeError: unicode argument expected" 
Merge pull request #228 from okin/master

Fixing failing tests under Py3K