Create namespace.rst

Proposed informational REP on driver namespaces.
Create laserscanner.rst

First draft of LaserScan rep.
Add units to time_offset
Change intensity parameter to more descriptive "publish_intensity"
Change *_angle params to angle_* to match messages
REP for releasing third party packages.
Added a benefit to having a package.xml upstream

contributed by @dirk-thomas
Added need for <build_type> tag in the package.xml
Added tutorial link and examples
Taking REP number 136, marking Informational
Added reference to mailing list for citation
Added some notes about what a third party package is and why we have them
Added Consequences section

This section describes the consequences of this
recommendation as it relates to dependent packages
finding and using third party packages.
Renamed to be REP 135
Posting to ROS users on 20/Feb/2013
Merge pull request #1 from ericperko/laserscanner

Laserscanner
Add REP 137 (rosdistro files)

This REP defines and specifies rosdistro files needed
to centralize ROS distribution information and to ease
building ROS on custom buildfarms
Small typo, reworded to be more clear about upstream package.xml
Merge pull request #28 from ahornung/patch-1

Small typo, reworded to be more clear about upstream package.xml
Updated to add more description to topics/params