Fix version comparison in com_installer database view
Change version comparison from smaller to unequal
Prepare 2.5.18
Prepare for 2.5.19 development
Update warnings.php

Extension Manager should not display a warning about PHP memory limit if memory_limit is set to -1
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33236
fix for Notice: Undefined variable: nowDate

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33248&start=8425
Merge pull request #3085 from vdespa/patch-3

fix for Notice: Undefined variable: nowDate
Merge pull request #2147 from Hackwar/inst_version_comp_25

Fixing com_installer database view version compare
Merge pull request #3083 from toivo/patch-3

Update warnings.php
Update checkin.php

Fixed checking of user rights.
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_id=8103&tracker_item_id=33265
Merge pull request #3101 from izmailow/patch-1

Update checkin.php