The DateTimeBuilder can now be injected as a dependency

Merge pull request #218 from alexdebril/issue/214

DateBuilder provided through dependency injection

Support dates with "UT" timezone

Merge pull request #217 from alexdebril/issue/209

Fix #209 : support format 'D, d M Y H:i:s \U\T'

Support date with "UT" timezone

backport of https://github.com/alexdebril/feed-io/releases/tag/v4.3.7 in release/3.0 branch

backport content:encoded alias

Fix #211 with a backport from the master branch

Fix date creation issue

Merge pull request #205 from alexdebril/Grotax-Grotax-patch-1

Grotax grotax patch 1

Fix date creation issue

Fixes #204

Fix "Last Modified" if equals to 1970-01-01

Merge pull request #198 from alexdebril/feature/fix-last-modified

Compare "lastModified" to 1970-01-01

RSS lastBuildDate detection + invalid characters filtering

Merge pull request #196 from alexdebril/issue/193

Remove invalid characters #193

CLI Read Command : Fixed error when lastModified is null

Merge pull request #190 from javierperezm/patch-1

Fixed error when lastModified is null

RSS Format : "content:encoded" is now an alias of "description"

Merge pull request #189 from alexdebril/issue/188

set 'content:encoded' as an alias of 'description'. Fix #188