Update package.xml

Removing all references to Eigen in package.xml and adding cmake_modules as a run dependency.
Update package.xml
Merging CMakeLists.txt from master
Changing hydro's version number to conform to new (self-imposed) versioning standard
Updating changelog prior to release of 1.1.2
Merging CMakeLists.txt from master into hydro_devel
Merging UTM transform additions from master branch
Merging master changes with hydro-devel
Added check for good GPS fix to utm_transform_node
Merging UTM transform node changes from master
Fix for linear velocity transformation as identified in issue #20
Merging changes from hydro-devel (issue #20)
Merging changes from differential branch
Merging changes from differential branch
Fixing bug with update vector
Fixing bug with update vector
Some changes to ease GPS integration
Some changes to ease GPS integration
Changelog update before checkin
Updating changelog prior to release