Change short version of '--verbose' to '-V'

https://github.com/mojombo/jekyll/pull/1518
https://github.com/mojombo/jekyll/issues/1659
Merge pull request #1660 from mojombo/fix-shorts

Change short version of '--verbose' to '-V'
Update history to reflect merge of #1660
documented 'jekyll_date_chart', 'jekyll_image_encode' and 'jekyll_quick_man' in the plugins list
Change day example to a one-digit
Merge pull request #1405 from GSI/master

documented new gem 'jekyll_image_encode' in the plugins list
Update history to reflect merge of #1405
Downgrade Listen to 1.3.x

This is so that we can be Ruby 1.8.x compatible.
Merge pull request #1663 from penibelst/emphasize-date-filters

Change day example to emphasize the leading zero
Update history to reflect merge of #1663
Referencing the documentation for jekyll-import installation

Currently, there are only beta releases of the jekyll-import gem, so to
install it, you have to do `gem install jekyll-import --pre`. Instead
of giving instructions that don't work right now, reference the
documentation. That way, this doesn't need to be updated again when
jekyll-import has a non-beta version; just the documentation will need
updating.
Fix 1.8.7 syntax errors.
Allow any versions of listen < 2.0 and >= 1.3
Restrict mime-types gem to pre-2.0.

A coveralls dep has a '>=' dependency on mime-types.
Merge pull request #1665 from mojombo/downgrade-listen

Fix Listen implementation so master is compatible with 1.8.7
Update history to reflect merge of #1665
Prepare for a 1.3.0.rc release
Add table_prefix option for jekyll-importer

Add table_prefix to use with WordPress and Joomla importers so they can modify the default value.
Merge pull request #1662 from carols10cents/fix-import-error-message

Add `--pre` to the recommended command to install jekyll-import.
Update history to reflect merge of #1662