Update package.xml

Removing all references to Eigen in package.xml and adding cmake_modules as a run dependency.
Update package.xml
Update package.xml
Merging CMakeLists.txt from master
Merging CMakeLists.txt from master
Changing hydro's version number to conform to new (self-imposed) versioning standard
Updating version number to match new versioning scheme
Updating changelog prior to release of 1.1.2
Updating changelong prior to 2.1.2 release
Updating changelong prior to 2.1.2 release
Merging CMakeLists.txt from master into hydro_devel
Merging CMakeLists.txt from master into indigo_devel
Merging UTM transform additions from master branch
Merging UTM transform additions from master branch
Merging master changes with hydro-devel
Merging master changes with indigo-devel
Merging UTM transform node changes from master
Merging UTM transform node changes from master
Fix for linear velocity transformation as identified in issue #20
Merging changes from hydro-devel (issue #20)